ZIP codes and county lines / AR

ZIP codes and county lines in Arkansas

243 of the 620 ZIP code areas in Arkansas, or 39.2%, overlap more than one county. If your territories, tax rules or service areas are set by county and your list is by ZIP, these are the rows where the two disagree.

ZIP code areas
620

Census ZCTAs with any land in Arkansas

In more than one county
243

39.2% of the state, against 30.1% nationally

At least 5% in a second county
182

29.4% of the state, more than a sliver

Cross a state line
10

Into Louisiana, Missouri, Mississippi, Oklahoma, Tennessee and Texas

How Arkansas compares

Arkansas ranks 15 of 52 (the 50 states, DC and Puerto Rico) by the share of its ZIP code areas that overlap more than one county. 75 of its counties have at least one split ZIP code area along an edge. 10 of its ZIP code areas also reach into Louisiana, Missouri, Mississippi, Oklahoma, Tennessee and Texas, so a ZIP list that is meant to stop at the state line does not.

Counties with the most split ZIP code areas

  1. Jefferson County: 14 ZIP codes shared with another county
  2. Pulaski County: 14 ZIP codes shared with another county
  3. Cleburne County: 12 ZIP codes shared with another county
  4. Franklin County: 12 ZIP codes shared with another county
  5. Newton County: 12 ZIP codes shared with another county

Every split ZIP code area in Arkansas

Each row is one ZCTA and the counties its land falls in, largest share first. Counties in another state are marked with that state. Sort by the share outside the main county to put the most evenly divided ones first.

Share of land by county
38769
  • Bolivar County, MS 92.5%
  • Desha County 7.5%
7.5%2
65729
  • Ozark County, MO 88.5%
  • Marion County 11.5%
11.5%2
65733
  • Taney County, MO 85.5%
  • Marion County 8.4%
  • Ozark County, MO 3.1%
  • Boone County 3.0%
14.5%4
65761
  • Ozark County, MO 64.9%
  • Taney County, MO 22.9%
  • Marion County 12.3%
35.1%3
71601
  • Jefferson County 99.5%
  • Lincoln County 0.5%
0.5%2
71602
  • Jefferson County 82.5%
  • Grant County 17.5%
17.5%2
71603
  • Jefferson County 84.5%
  • Lincoln County 7.8%
  • Cleveland County 5.2%
  • Grant County 2.5%
15.5%4
71635
  • Ashley County 100.0%
  • Bradley County under 0.1%
under 0.1%2
71638
  • Drew County 65.7%
  • Chicot County 25.6%
  • Desha County 8.7%
34.3%3
71639
  • Lincoln County 53.4%
  • Desha County 46.6%
46.6%2
71642
  • Ashley County 57.8%
  • Drew County 42.2%
42.2%2
71643
  • Lincoln County 92.9%
  • Desha County 7.1%
7.1%2
71644
  • Lincoln County 68.0%
  • Jefferson County 32.0%
32.0%2
71646
  • Ashley County 96.3%
  • Drew County 3.7%
3.7%2
71655
  • Drew County 99.3%
  • Lincoln County 0.7%
0.7%2
71658
  • Ashley County 97.3%
  • Drew County 2.7%
2.7%2
71660
  • Cleveland County 99.6%
  • Bradley County 0.4%
0.4%2
71661
  • Ashley County 75.7%
  • Chicot County 24.3%
24.3%2
71663
  • Chicot County 63.7%
  • Ashley County 36.3%
36.3%2
71665
  • Cleveland County 97.3%
  • Jefferson County 2.8%
2.8%2
71667
  • Lincoln County 94.7%
  • Cleveland County 5.3%
5.3%2
71670
  • Desha County 70.0%
  • Drew County 30.0%
30.0%2
71671
  • Bradley County 93.0%
  • Cleveland County 4.0%
  • Drew County 3.0%
7.0%3
71675
  • Drew County 83.8%
  • Bradley County 10.3%
  • Lincoln County 6.0%
16.2%3
71676
  • Ashley County 86.7%
  • Chicot County 13.3%
13.3%2
71701
  • Ouachita County 81.3%
  • Calhoun County 18.7%
18.7%2
71720
  • Ouachita County 54.2%
  • Dallas County 39.9%
  • Calhoun County 5.9%
45.8%3
71725
  • Dallas County 84.2%
  • Cleveland County 15.8%
15.8%2
71726
  • Ouachita County 99.0%
  • Nevada County 1.0%
1.0%2
71742
  • Dallas County 68.8%
  • Calhoun County 31.2%
31.2%2
71749
  • Union County 98.2%
  • Claiborne Parish, LA 1.7%
  • Union Parish, LA 0.1%
1.8%3
71752
  • Columbia County 98.6%
  • Nevada County 1.4%
1.4%2
71753
  • Columbia County 95.9%
  • Union County 4.1%
4.1%2
71762
  • Union County 90.7%
  • Ouachita County 9.3%
9.3%2
71763
  • Dallas County 85.3%
  • Ouachita County 11.0%
  • Clark County 3.7%
14.8%3
71764
  • Ouachita County 63.1%
  • Columbia County 23.3%
  • Nevada County 13.1%
  • Union County 0.5%
36.9%4
71770
  • Columbia County 73.6%
  • Nevada County 26.4%
26.4%2
71801
  • Hempstead County 97.9%
  • Lafayette County 2.1%
2.1%2
71827
  • Lafayette County 63.4%
  • Nevada County 36.6%
36.6%2
71831
  • Howard County 81.3%
  • Hempstead County 18.7%
18.7%2
71833
  • Howard County 90.3%
  • Sevier County 9.7%
9.7%2
71835
  • Nevada County 81.7%
  • Hempstead County 18.3%
18.3%2
71838
  • Hempstead County 94.5%
  • Miller County 5.4%
  • Howard County under 0.1%
5.5%3
71841
  • Sevier County 87.4%
  • Polk County 12.6%
12.6%2
71846
  • Sevier County 98.8%
  • Little River County 1.3%
1.3%2
71852
  • Howard County 62.9%
  • Pike County 18.8%
  • Hempstead County 18.3%
37.1%3
71857
  • Nevada County 86.8%
  • Hempstead County 13.2%
  • Ouachita County under 0.1%
13.2%3
71859
  • Hempstead County 82.2%
  • Howard County 17.9%
17.9%2
71860
  • Lafayette County 74.5%
  • Columbia County 23.1%
  • Nevada County 2.3%
25.5%3
71861
  • Lafayette County 53.4%
  • Columbia County 46.6%
46.6%2
71866
  • Little River County 100.0%
  • Sevier County under 0.1%
under 0.1%2
71901
  • Garland County 99.5%
  • Hot Spring County 0.5%
0.5%2
71909
  • Garland County 73.3%
  • Saline County 26.7%
26.7%2
71913
  • Garland County 76.2%
  • Hot Spring County 23.9%
23.9%2
71921
  • Clark County 69.1%
  • Pike County 22.5%
  • Hot Spring County 8.4%
30.9%3
71923
  • Clark County 88.9%
  • Hot Spring County 6.8%
  • Dallas County 4.3%
11.1%3
71929
  • Hot Spring County 98.2%
  • Clark County 1.8%
1.8%2
71933
  • Garland County 37.4%
  • Montgomery County 34.9%
  • Hot Spring County 27.7%
62.6%3
71937
  • Polk County 93.8%
  • McCurtain County, OK 6.3%
6.3%2
71943
  • Pike County 64.9%
  • Montgomery County 32.6%
  • Hot Spring County 2.5%
35.1%3
71953
  • Polk County 75.3%
  • Scott County 19.5%
  • Le Flore County, OK 5.2%
24.7%3
71959
  • Pike County 50.1%
  • Howard County 49.9%
49.9%2
71964
  • Garland County 81.5%
  • Hot Spring County 18.5%
18.5%2
71971
  • Howard County 83.5%
  • Pike County 16.5%
16.5%2
71973
  • Polk County 62.8%
  • Howard County 37.2%
37.2%2
72001
  • Perry County 54.3%
  • Conway County 45.7%
45.7%2
72002
  • Saline County 92.7%
  • Pulaski County 7.3%
7.3%2
72004
  • Jefferson County 97.5%
  • Arkansas County 2.5%
2.5%2
72011
  • Saline County 95.5%
  • Grant County 4.5%
4.5%2
72013
  • Van Buren County 93.7%
  • Conway County 6.3%
6.3%2
72015
  • Saline County 76.2%
  • Grant County 23.8%
23.8%2
72016
  • Perry County 77.3%
  • Pulaski County 22.7%
22.7%2
72020
  • Jackson County 50.3%
  • White County 31.5%
  • Independence County 18.2%
49.7%3
72021
  • Monroe County 88.4%
  • Woodruff County 9.6%
  • St. Francis County 2.0%
11.6%3
72023
  • Lonoke County 68.8%
  • Pulaski County 27.3%
  • Faulkner County 4.0%
31.3%3
72024
  • Lonoke County 93.4%
  • Prairie County 6.6%
6.6%2
72025
  • Perry County 69.3%
  • Conway County 23.8%
  • Yell County 6.9%
30.7%3
72029
  • Monroe County 100.0%
  • Prairie County under 0.1%
under 0.1%2
72030
  • Conway County 77.6%
  • Van Buren County 22.4%
22.4%2
72031
  • Van Buren County 90.6%
  • Stone County 4.8%
  • Conway County 4.6%
9.4%3
72036
  • Woodruff County 80.5%
  • Monroe County 19.5%
19.5%2
72039
  • Faulkner County 54.0%
  • Van Buren County 46.0%
46.0%2
72040
  • Prairie County 93.0%
  • Woodruff County 7.0%
7.0%2
72044
  • Cleburne County 71.7%
  • Stone County 28.3%
28.3%2
72046
  • Lonoke County 71.3%
  • Pulaski County 16.9%
  • Jefferson County 11.8%
28.7%3
72060
  • White County 59.6%
  • Prairie County 40.4%
40.4%2
72063
  • Conway County 97.8%
  • Pope County 2.3%
2.3%2
72065
  • Saline County 57.6%
  • Pulaski County 25.6%
  • Grant County 16.8%
42.4%3
72067
  • Cleburne County 86.0%
  • Van Buren County 14.0%
14.0%2
72069
  • Monroe County 92.3%
  • Phillips County 7.8%
7.8%2
72072
  • Lonoke County 74.8%
  • Jefferson County 25.2%
25.2%2
72073
  • Arkansas County 91.0%
  • Jefferson County 9.1%
9.1%2
72076
  • Pulaski County 84.7%
  • Lonoke County 10.8%
  • Faulkner County 4.5%
15.3%3
72079
  • Jefferson County 65.3%
  • Grant County 34.7%
34.7%2
72080
  • Van Buren County 44.9%
  • Conway County 33.8%
  • Pope County 21.3%
55.1%3
72081
  • White County 99.1%
  • Independence County 0.9%
0.9%2
72084
  • Dallas County 58.1%
  • Grant County 30.0%
  • Hot Spring County 11.9%
41.9%3
72086
  • Lonoke County 95.8%
  • Prairie County 4.2%
4.2%2
72087
  • Saline County 63.8%
  • Garland County 36.2%
36.2%2
72088
  • Van Buren County 84.3%
  • Cleburne County 15.7%
15.7%2
72101
  • Woodruff County 88.9%
  • Jackson County 10.7%
  • Cross County 0.4%
11.1%3
72103
  • Saline County 77.3%
  • Pulaski County 22.7%
22.7%2
72104
  • Hot Spring County 95.3%
  • Garland County 2.8%
  • Saline County 1.3%
  • Grant County 0.7%
4.8%4
72106
  • Faulkner County 98.2%
  • Pulaski County 1.8%
1.8%2
72111
  • Faulkner County 72.6%
  • White County 27.4%
27.4%2
72112
  • Jackson County 92.8%
  • Woodruff County 4.8%
  • Independence County 2.4%
7.2%3
72120
  • Pulaski County 68.9%
  • Faulkner County 31.1%
31.1%2
72121
  • White County 80.5%
  • Cleburne County 19.5%
19.5%2
72122
  • Saline County 89.8%
  • Pulaski County 10.2%
10.2%2
72125
  • Perry County 63.3%
  • Conway County 36.7%
36.7%2
72126
  • Perry County 95.5%
  • Pulaski County 4.5%
4.5%2
72131
  • Cleburne County 66.5%
  • Faulkner County 26.1%
  • Van Buren County 7.3%
33.5%3
72132
  • Jefferson County 55.1%
  • Grant County 44.9%
44.9%2
72134
  • Monroe County 91.5%
  • Arkansas County 8.5%
8.5%2
72137
  • White County 77.1%
  • Cleburne County 22.9%
22.9%2
72142
  • Lonoke County 62.7%
  • Pulaski County 37.3%
37.3%2
72143
  • White County 97.5%
  • Cleburne County 2.5%
2.5%2
72150
  • Grant County 99.3%
  • Jefferson County 0.7%
0.7%2
72153
  • Van Buren County 78.3%
  • Stone County 15.7%
  • Cleburne County 6.0%
21.7%3
72160
  • Arkansas County 59.6%
  • Prairie County 28.8%
  • Jefferson County 10.7%
  • Lonoke County 0.9%
40.4%4
72167
  • Saline County 46.0%
  • Grant County 35.1%
  • Hot Spring County 18.9%
54.0%3
72175
  • Jefferson County 95.9%
  • Arkansas County 4.1%
4.1%2
72176
  • Lonoke County 67.0%
  • Prairie County 33.0%
33.0%2
72206
  • Pulaski County 94.6%
  • Saline County 5.4%
5.4%2
72210
  • Pulaski County 72.7%
  • Saline County 27.3%
27.3%2
72324
  • Cross County 96.5%
  • Poinsett County 3.5%
3.5%2
72326
  • St. Francis County 93.2%
  • Cross County 6.8%
6.8%2
72328
  • Desha County 73.5%
  • Phillips County 26.6%
26.6%2
72331
  • Crittenden County 66.9%
  • Cross County 33.1%
33.1%2
72335
  • St. Francis County 95.8%
  • Lee County 4.2%
4.2%2
72338
  • Tipton County, TN 66.3%
  • Mississippi County 33.7%
33.7%2
72346
  • St. Francis County 90.8%
  • Crittenden County 6.6%
  • Cross County 2.5%
9.2%3
72347
  • Cross County 77.0%
  • Jackson County 23.0%
23.0%2
72348
  • Crittenden County 47.0%
  • St. Francis County 41.9%
  • Lee County 11.1%
53.0%3
72354
  • Poinsett County 77.9%
  • Mississippi County 22.1%
22.1%2
72355
  • Phillips County 92.6%
  • Lee County 7.4%
7.4%2
72366
  • Phillips County 93.6%
  • Monroe County 3.9%
  • Lee County 2.6%
6.4%3
72368
  • Lee County 85.7%
  • Monroe County 14.3%
14.3%2
72372
  • St. Francis County 79.9%
  • Lee County 20.1%
20.1%2
72374
  • Phillips County 98.3%
  • Lee County 1.7%
1.7%2
72376
  • Crittenden County 96.9%
  • St. Francis County 3.1%
3.1%2
72386
  • Poinsett County 42.1%
  • Crittenden County 35.0%
  • Mississippi County 22.9%
57.9%3
72392
  • St. Francis County 88.2%
  • Woodruff County 7.5%
  • Monroe County 4.3%
11.8%3
72396
  • Cross County 94.9%
  • St. Francis County 5.1%
5.1%2
72401
  • Craighead County 91.2%
  • Greene County 8.8%
8.8%2
72413
  • Randolph County 80.0%
  • Clay County 20.0%
20.0%2
72416
  • Craighead County 55.1%
  • Greene County 44.9%
44.9%2
72419
  • Craighead County 95.0%
  • Poinsett County 5.0%
5.0%2
72421
  • Craighead County 92.3%
  • Poinsett County 7.7%
7.7%2
72425
  • Greene County 82.2%
  • Randolph County 17.8%
17.8%2
72434
  • Randolph County 68.1%
  • Lawrence County 31.9%
31.9%2
72436
  • Greene County 70.5%
  • Clay County 29.5%
29.5%2
72438
  • Mississippi County 93.0%
  • Craighead County 7.0%
7.0%2
72450
  • Greene County 98.3%
  • Craighead County 1.7%
1.7%2
72459
  • Randolph County 39.3%
  • Lawrence County 36.5%
  • Sharp County 24.2%
60.7%3
72461
  • Clay County 82.9%
  • Greene County 17.1%
17.1%2
72466
  • Lawrence County 59.1%
  • Sharp County 40.9%
40.9%2
72469
  • Lawrence County 75.4%
  • Sharp County 24.6%
24.6%2
72476
  • Lawrence County 82.6%
  • Randolph County 8.9%
  • Craighead County 6.2%
  • Greene County 2.3%
17.4%4
72479
  • Poinsett County 87.8%
  • Jackson County 6.6%
  • Craighead County 5.6%
12.2%3
72482
  • Sharp County 99.7%
  • Lawrence County 0.3%
0.3%2
72501
  • Independence County 99.2%
  • Izard County 0.8%
0.8%2
72512
  • Izard County 99.5%
  • Fulton County 0.5%
0.5%2
72513
  • Sharp County 50.5%
  • Fulton County 36.5%
  • Izard County 13.0%
49.5%3
72519
  • Baxter County 38.1%
  • Stone County 30.0%
  • Izard County 29.1%
  • Fulton County 2.8%
61.9%4
72521
  • Sharp County 68.0%
  • Independence County 32.0%
32.0%2
72523
  • Cleburne County 80.5%
  • Independence County 19.5%
19.5%2
72529
  • Sharp County 55.1%
  • Fulton County 44.9%
44.9%2
72530
  • Cleburne County 94.0%
  • Stone County 6.0%
6.0%2
72531
  • Fulton County 61.1%
  • Baxter County 38.9%
38.9%2
72532
  • Sharp County 83.7%
  • Izard County 16.3%
16.3%2
72534
  • Independence County 81.2%
  • Cleburne County 18.8%
18.8%2
72542
  • Sharp County 81.5%
  • Fulton County 18.5%
18.5%2
72550
  • Independence County 68.9%
  • Cleburne County 18.6%
  • Stone County 12.6%
31.1%3
72554
  • Fulton County 81.9%
  • Sharp County 18.1%
18.1%2
72560
  • Stone County 99.5%
  • Izard County 0.5%
0.5%2
72568
  • Independence County 92.5%
  • White County 7.5%
7.5%2
72572
  • Lawrence County 75.4%
  • Independence County 24.6%
24.6%2
72576
  • Fulton County 99.8%
  • Izard County 0.2%
0.2%2
72577
  • Izard County 64.8%
  • Sharp County 35.2%
35.2%2
72579
  • Independence County 78.7%
  • Sharp County 21.3%
21.3%2
72601
  • Boone County 91.5%
  • Newton County 5.8%
  • Marion County 2.7%
8.5%3
72611
  • Carroll County 66.9%
  • Boone County 29.9%
  • Newton County 3.2%
33.1%3
72617
  • Baxter County 97.7%
  • Stone County 2.3%
  • Searcy County under 0.1%
2.3%3
72624
  • Newton County 85.2%
  • Carroll County 14.8%
14.8%2
72632
  • Carroll County 97.8%
  • Madison County 2.2%
2.2%2
72633
  • Marion County 52.3%
  • Boone County 31.5%
  • Searcy County 16.2%
47.7%3
72638
  • Carroll County 95.2%
  • Newton County 4.8%
4.8%2
72639
  • Searcy County 90.5%
  • Marion County 9.5%
9.5%2
72644
  • Boone County 91.1%
  • Marion County 7.5%
  • Taney County, MO 1.3%
8.9%3
72645
  • Searcy County 66.3%
  • Van Buren County 19.3%
  • Stone County 14.4%
33.6%3
72650
  • Searcy County 97.0%
  • Stone County 3.0%
3.0%2
72653
  • Baxter County 97.6%
  • Marion County 2.4%
2.4%2
72662
  • Boone County 98.6%
  • Carroll County 1.4%
1.4%2
72675
  • Searcy County 86.4%
  • Marion County 13.6%
13.6%2
72679
  • Searcy County 85.0%
  • Van Buren County 11.0%
  • Pope County 4.0%
15.0%3
72680
  • Stone County 91.1%
  • Searcy County 8.9%
8.9%2
72685
  • Newton County 81.3%
  • Searcy County 16.8%
  • Boone County 1.9%
18.7%3
72686
  • Pope County 57.8%
  • Searcy County 42.2%
42.2%2
72687
  • Marion County 99.7%
  • Boone County 0.3%
0.3%2
72703
  • Washington County 95.2%
  • Madison County 4.8%
4.8%2
72704
  • Washington County 98.6%
  • Benton County 1.4%
1.4%2
72721
  • Madison County 51.6%
  • Franklin County 48.4%
48.4%2
72727
  • Madison County 63.3%
  • Washington County 32.2%
  • Franklin County 4.5%
36.8%3
72734
  • Benton County 98.8%
  • Washington County 1.2%
1.2%2
72738
  • Madison County 79.7%
  • Washington County 13.2%
  • Benton County 7.1%
20.3%3
72740
  • Madison County 90.5%
  • Carroll County 7.7%
  • Newton County 1.8%
9.5%3
72742
  • Madison County 84.8%
  • Newton County 15.2%
15.2%2
72752
  • Madison County 49.5%
  • Newton County 30.9%
  • Johnson County 19.6%
50.5%3
72756
  • Benton County 89.1%
  • Madison County 10.9%
10.9%2
72761
  • Benton County 95.3%
  • Washington County 4.7%
4.7%2
72762
  • Washington County 78.6%
  • Benton County 21.4%
21.4%2
72764
  • Washington County 91.1%
  • Benton County 8.9%
8.9%2
72773
  • Madison County 97.0%
  • Washington County 3.0%
3.0%2
72821
  • Franklin County 64.8%
  • Johnson County 35.2%
35.2%2
72823
  • Pope County 78.6%
  • Conway County 21.4%
21.4%2
72827
  • Yell County 84.5%
  • Scott County 15.5%
15.5%2
72833
  • Yell County 87.0%
  • Scott County 13.0%
13.0%2
72834
  • Yell County 97.2%
  • Logan County 2.8%
2.8%2
72838
  • Yell County 83.7%
  • Scott County 16.3%
16.3%2
72839
  • Johnson County 87.7%
  • Pope County 11.0%
  • Newton County 1.2%
12.3%3
72841
  • Scott County 96.0%
  • Yell County 4.0%
4.0%2
72842
  • Yell County 100.0%
  • Logan County under 0.1%
under 0.1%2
72846
  • Johnson County 86.5%
  • Pope County 13.6%
13.6%2
72847
  • Pope County 69.6%
  • Johnson County 30.4%
30.4%2
72852
  • Johnson County 83.6%
  • Newton County 15.8%
  • Madison County 0.6%
16.4%3
72853
  • Yell County 87.2%
  • Perry County 12.8%
12.8%2
72854
  • Johnson County 64.2%
  • Newton County 35.8%
35.8%2
72855
  • Logan County 98.8%
  • Franklin County 1.2%
1.2%2
72856
  • Newton County 83.8%
  • Pope County 16.2%
16.2%2
72857
  • Yell County 61.8%
  • Perry County 38.2%
38.2%2
72927
  • Logan County 67.8%
  • Scott County 29.8%
  • Sebastian County 2.4%
32.2%3
72930
  • Franklin County 77.3%
  • Sebastian County 22.7%
22.7%2
72933
  • Franklin County 83.8%
  • Sebastian County 11.6%
  • Logan County 4.6%
16.2%3
72943
  • Logan County 96.2%
  • Yell County 3.5%
  • Franklin County 0.3%
3.9%3
72944
  • Sebastian County 67.7%
  • Scott County 32.3%
32.3%2
72946
  • Crawford County 88.2%
  • Franklin County 11.8%
11.8%2
72947
  • Franklin County 53.8%
  • Crawford County 46.2%
46.2%2
72948
  • Crawford County 96.6%
  • Washington County 3.4%
3.4%2
72949
  • Franklin County 87.7%
  • Johnson County 10.3%
  • Logan County 2.0%
12.3%3
72951
  • Logan County 53.1%
  • Franklin County 46.9%
46.9%2
72959
  • Washington County 59.1%
  • Crawford County 25.4%
  • Franklin County 15.5%
40.9%3
75556
  • Cass County, TX 99.1%
  • Miller County 0.9%
0.9%2

What to do with this

If a ZIP code in your list is split, the ZIP alone cannot tell you which county an address is in. For most work that is fine. It matters when the county decides something: a sales tax rate, a licence, a franchise agreement written by county, or a service area somebody promised by county name.

The ZIP list audit checks your own list against the same Census data in your browser, and the ZIP spreadsheet comparison covers when a ZIP list is enough and when it is not.

What these numbers are, and are not

  • A ZCTA is not quite a ZIP code. ZIP Code Tabulation Areas are the Census Bureau's approximations of ZIP code areas, built by grouping census blocks by the ZIP codes of the addresses in them. USPS ZIP codes are delivery routes, not areas, and the two do not always match.
  • Some ZIP codes have no ZCTA at all. PO box ZIPs, ZIPs for a single building or a single large organisation, and military ZIPs usually have no area of their own, so they cannot be split across counties here and will not match any area in a map.
  • Land share is not population share. A ZCTA with 20% of its land in a second county might have almost none of its people there, or most of them. The shares here measure area, which is what the Census file publishes.
  • Tiny overlaps are included. A ZCTA counts as overlapping a county if the Census file lists any part of it there, including slivers along a road or river. That is why the share with at least 5% of land in a second county is shown alongside.

Source: U.S. Census Bureau, 2020 ZCTA to County relationship file, public domain. Counts use 2020 ZCTAs and 2020 county boundaries. ZIP codes added by USPS since then are not in it, and Connecticut's counties have since been replaced by planning regions in Census data.

Route by the boundary, not the ZIP

MapLogics decides who owns an address from a boundary you draw or import, so a ZIP that straddles two counties is answered by where the address actually is. There is a free trial if you want to see it on your own addresses.

Try it free