ZIP codes and county lines in North Dakota

197 of the 400 ZIP code areas in North Dakota, or 49.3%, 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: 400
In more than one county: 197
At least 5% in a second county: 168
Cross a state line: 26

How North Dakota compares

North Dakota ranks 7 of 52 (the 50 states, DC and Puerto Rico) by the share of its ZIP code areas that overlap more than one county. 53 of its counties have at least one split ZIP code area along an edge. 26 of its ZIP code areas also reach into Minnesota, Montana and South Dakota, so a ZIP list that is meant to stop at the state line does not.

Counties with the most split ZIP code areas

Barnes County: 15 ZIP codes shared with another county
Ward County: 15 ZIP codes shared with another county
McHenry County: 14 ZIP codes shared with another county
Stutsman County: 14 ZIP codes shared with another county
Benson County: 12 ZIP codes shared with another county

Every split ZIP code area in North Dakota

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
56744	Marshall County, MN 49.9% Polk County, MN 23.6% Walsh County 22.8% Grand Forks County 3.7%	50.1%	4
57255	Roberts County, SD 95.5% Richland County 4.5%	4.5%	2
57430	Marshall County, SD 99.1% Sargent County 0.9%	0.9%	2
57638	Perkins County, SD 60.2% Adams County 25.3% Grant County 5.1% Sioux County 4.7% Corson County, SD 4.7%	39.8%	5
57641	Corson County, SD 62.4% Sioux County 27.8% Grant County 9.7%	37.6%	3
57642	Corson County, SD 97.0% Sioux County 3.0%	3.0%	2
57645	Corson County, SD 51.9% Grant County 26.8% Sioux County 21.3%	48.1%	3
57648	Emmons County 51.1% Campbell County, SD 48.9%	48.9%	2
57660	Corson County, SD 88.0% Sioux County 12.0%	12.0%	2
58016	Traill County 54.6% Steele County 45.4%	45.4%	2
58027	Ransom County 44.8% Cass County 41.2% Barnes County 14.1%	55.2%	3
58030	Richland County 98.7% Wilkin County, MN 1.3%	1.3%	2
58031	Cass County 53.8% Barnes County 46.2%	46.2%	2
58035	Traill County 42.2% Cass County 33.7% Steele County 24.1%	57.8%	3
58038	Traill County 59.9% Cass County 40.1%	40.1%	2
58041	Richland County 99.2% Roberts County, SD 0.8%	0.8%	2
58043	Sargent County 95.1% Marshall County, SD 4.9%	4.9%	2
58046	Steele County 85.4% Barnes County 12.9% Cass County 1.7%	14.6%	3
58047	Cass County 97.4% Richland County 2.6%	2.6%	2
58048	Cass County 76.1% Traill County 23.9%	23.9%	2
58049	Barnes County 69.7% Ransom County 22.8% LaMoure County 7.5%	30.3%	3
58051	Cass County 59.3% Richland County 40.7%	40.7%	2
58052	Cass County 55.9% Richland County 33.0% Ransom County 11.1%	44.1%	3
58053	Richland County 71.1% Sargent County 20.9% Roberts County, SD 5.9% Marshall County, SD 2.0%	28.9%	4
58056	Steele County 44.5% Barnes County 43.8% Griggs County 11.7%	55.5%	3
58057	Richland County 58.5% Ransom County 41.5%	41.5%	2
58060	Sargent County 58.1% Ransom County 41.5% Richland County 0.4%	41.9%	3
58062	Barnes County 58.9% Ransom County 41.1%	41.1%	2
58064	Cass County 74.4% Barnes County 23.9% Steele County 1.7%	25.6%	3
58068	Ransom County 98.2% Cass County 1.8%	1.8%	2
58069	Sargent County 95.5% Ransom County 4.5%	4.5%	2
58071	Cass County 56.1% Barnes County 43.9%	43.9%	2
58081	Richland County 99.7% Sargent County 0.3%	0.3%	2
58212	Nelson County 47.1% Griggs County 34.1% Grand Forks County 12.4% Steele County 6.4%	52.9%	4
58220	Pembina County 91.8% Cavalier County 8.2%	8.2%	2
58225	Pembina County 65.9% Walsh County 22.8% Kittson County, MN 11.4%	34.1%	3
58227	Walsh County 49.2% Pembina County 39.5% Cavalier County 11.2%	50.8%	3
58229	Walsh County 60.8% Cavalier County 32.8% Ramsey County 6.4%	39.2%	3
58231	Walsh County 59.9% Grand Forks County 40.1%	40.1%	2
58233	Walsh County 61.6% Grand Forks County 38.4%	38.4%	2
58240	Steele County 47.3% Traill County 33.3% Grand Forks County 19.4%	52.7%	3
58243	Walsh County 79.5% Pembina County 20.5%	20.5%	2
58260	Cavalier County 98.3% Walsh County 1.7%	1.7%	2
58261	Walsh County 63.6% Grand Forks County 36.4%	36.4%	2
58266	Grand Forks County 72.1% Nelson County 27.9%	27.9%	2
58267	Grand Forks County 96.3% Steele County 3.7%	3.7%	2
58274	Steele County 54.4% Traill County 45.6%	45.6%	2
58275	Grand Forks County 70.5% Traill County 29.5%	29.5%	2
58282	Pembina County 55.8% Cavalier County 44.2%	44.2%	2
58301	Ramsey County 91.0% Benson County 9.0%	9.0%	2
58310	Rolette County 93.1% Towner County 6.9%	6.9%	2
58317	Towner County 95.2% Rolette County 4.8%	4.8%	2
58321	Ramsey County 45.4% Nelson County 38.3% Walsh County 16.4%	54.6%	3
58323	Cavalier County 81.5% Towner County 18.4%	18.4%	2
58324	Towner County 99.1% Benson County 0.9%	0.9%	2
58325	Ramsey County 66.8% Benson County 33.3%	33.3%	2
58329	Rolette County 86.7% Bottineau County 13.3%	13.3%	2
58330	Ramsey County 97.7% Cavalier County 2.3%	2.3%	2
58332	Benson County 77.1% Pierce County 22.9%	22.9%	2
58338	Ramsey County 53.7% Cavalier County 46.3%	46.3%	2
58341	Wells County 74.2% Pierce County 20.3% Benson County 2.7% Sheridan County 2.7%	25.8%	4
58344	Nelson County 93.4% Ramsey County 6.6%	6.6%	2
58345	Ramsey County 65.1% Walsh County 34.9%	34.9%	2
58346	Benson County 86.4% Towner County 12.4% Pierce County 1.3%	13.6%	3
58348	Benson County 89.6% Wells County 10.4%	10.4%	2
58352	Cavalier County 88.1% Towner County 11.9%	11.9%	2
58356	Eddy County 81.3% Wells County 12.7% Foster County 6.0%	18.7%	3
58363	Towner County 81.2% Rolette County 18.8%	18.8%	2
58366	Rolette County 93.3% Pierce County 6.7%	6.7%	2
58367	Rolette County 62.7% Towner County 37.3%	37.3%	2
58368	Pierce County 88.1% McHenry County 6.9% Benson County 5.0%	11.9%	3
58372	Towner County 56.8% Cavalier County 43.2%	43.2%	2
58374	Eddy County 52.4% Benson County 35.7% Wells County 11.9%	47.6%	3
58377	Ramsey County 68.3% Towner County 17.7% Cavalier County 14.0%	31.7%	3
58380	Nelson County 49.0% Eddy County 36.3% Benson County 14.7%	51.0%	3
58381	Eddy County 60.9% Benson County 39.1%	39.1%	2
58384	Bottineau County 43.3% McHenry County 22.6% Pierce County 19.9% Rolette County 14.3%	56.7%	4
58385	Pierce County 95.5% Rolette County 4.5%	4.5%	2
58386	Benson County 68.4% Pierce County 31.6%	31.6%	2
58413	McIntosh County 85.2% Dickey County 8.1% McPherson County, SD 6.8%	14.8%	3
58418	Wells County 82.5% Kidder County 17.4%	17.4%	2
58421	Foster County 82.9% Stutsman County 7.9% Wells County 5.7% Eddy County 3.4%	17.1%	4
58423	Wells County 74.7% Kidder County 25.3%	25.3%	2
58425	Griggs County 98.7% Steele County 1.4%	1.4%	2
58426	Stutsman County 95.6% Foster County 4.4%	4.4%	2
58429	Barnes County 97.6% Griggs County 2.4%	2.4%	2
58433	LaMoure County 80.3% Dickey County 19.8%	19.8%	2
58436	Dickey County 95.4% Brown County, SD 4.6%	4.6%	2
58439	Dickey County 62.8% McPherson County, SD 35.1% Brown County, SD 2.1%	37.2%	3
58440	Logan County 54.2% McIntosh County 45.8%	45.8%	2
58442	Logan County 79.3% Stutsman County 20.7%	20.7%	2
58445	Foster County 65.0% Eddy County 35.0%	35.0%	2
58448	Griggs County 99.4% Barnes County 0.6%	0.6%	2
58454	LaMoure County 63.8% Stutsman County 36.2%	36.2%	2
58455	Stutsman County 58.6% Foster County 41.4%	41.4%	2
58456	Dickey County 43.6% LaMoure County 37.4% McIntosh County 19.0%	56.4%	3
58458	LaMoure County 93.7% Dickey County 6.3%	6.3%	2
58460	Logan County 59.0% McIntosh County 41.0%	41.0%	2
58461	Barnes County 55.6% LaMoure County 44.4%	44.4%	2
58464	Eddy County 54.7% Foster County 35.5% Griggs County 9.7%	45.3%	3
58466	LaMoure County 61.7% Barnes County 35.9% Stutsman County 2.4%	38.3%	3
58467	Stutsman County 83.4% Kidder County 16.6%	16.6%	2
58472	Stutsman County 63.2% LaMoure County 36.8%	36.8%	2
58474	Dickey County 86.7% Sargent County 12.6% LaMoure County 0.7%	13.3%	3
58475	Kidder County 78.6% Stutsman County 21.4%	21.4%	2
58481	Barnes County 64.9% Stutsman County 35.1%	35.1%	2
58483	Stutsman County 42.5% Logan County 29.2% Kidder County 28.3%	57.5%	3
58484	Griggs County 73.4% Foster County 26.6%	26.6%	2
58486	Wells County 80.3% Stutsman County 19.7%	19.7%	2
58490	LaMoure County 70.4% Ransom County 29.6%	29.6%	2
58492	Barnes County 54.7% Stutsman County 28.8% Griggs County 16.5%	45.3%	3
58495	McIntosh County 60.8% Logan County 39.2%	39.2%	2
58497	Stutsman County 92.1% Barnes County 7.9%	7.9%	2
58520	Morton County 68.8% Grant County 31.2%	31.2%	2
58523	Mercer County 70.8% Oliver County 29.1%	29.1%	2
58524	Emmons County 57.6% Kidder County 25.2% Burleigh County 17.2%	42.4%	3
58530	Oliver County 99.6% Mercer County 0.4%	0.4%	2
58532	Burleigh County 61.5% Kidder County 38.5%	38.5%	2
58535	Morton County 62.7% Grant County 37.3%	37.3%	2
58545	Mercer County 76.0% Oliver County 24.0%	24.0%	2
58549	Emmons County 56.3% Logan County 40.6% Kidder County 3.0%	43.7%	3
58554	Morton County 94.3% Oliver County 5.7%	5.7%	2
58559	McLean County 73.2% Sheridan County 26.8%	26.8%	2
58560	Burleigh County 62.4% Emmons County 37.6%	37.6%	2
58562	Grant County 62.8% Hettinger County 28.8% Adams County 8.4%	37.2%	3
58563	Morton County 68.2% Oliver County 30.1% Grant County 1.7%	31.8%	3
58568	Sioux County 99.6% Corson County, SD 0.4%	0.4%	2
58570	Morton County 51.5% Sioux County 48.5%	48.5%	2
58571	Mercer County 69.7% Oliver County 30.3%	30.3%	2
58579	Burleigh County 69.4% McLean County 30.6%	30.6%	2
58601	Stark County 66.2% Dunn County 33.8%	33.8%	2
58620	Slope County 98.5% Billings County 1.4%	1.4%	2
58621	Golden Valley County 90.7% Wibaux County, MT 4.4% McKenzie County 2.8% Billings County 2.1%	9.3%	4
58622	Billings County 70.9% Stark County 28.6% Slope County 0.4%	29.1%	3
58623	Bowman County 72.7% Slope County 25.4% Harding County, SD 1.9%	27.3%	3
58625	Dunn County 72.4% Mercer County 27.6%	27.6%	2
58630	Stark County 62.4% Dunn County 37.6%	37.6%	2
58631	Morton County 61.5% Grant County 29.6% Mercer County 8.8%	38.5%	3
58634	McKenzie County 97.6% Billings County 2.4%	2.4%	2
58636	Dunn County 93.9% Mercer County 6.1%	6.1%	2
58638	Morton County 42.6% Mercer County 30.2% Stark County 16.4% Grant County 6.7% Dunn County 4.1%	57.4%	5
58639	Adams County 78.8% Perkins County, SD 21.2%	21.2%	2
58640	Dunn County 98.0% Billings County 1.2% McKenzie County 0.9%	2.0%	3
58642	Dunn County 94.7% Billings County 5.3%	5.3%	2
58643	Bowman County 70.5% Slope County 29.5%	29.5%	2
58645	Billings County 92.0% Golden Valley County 8.0%	8.0%	2
58646	Hettinger County 89.6% Adams County 9.0% Stark County 1.4%	10.4%	3
58647	Slope County 47.4% Hettinger County 44.5% Stark County 8.2%	52.6%	3
58649	Adams County 72.7% Hettinger County 11.1% Harding County, SD 9.4% Bowman County 4.7% Slope County 2.1%	27.3%	5
58650	Hettinger County 93.1% Adams County 6.9%	6.9%	2
58651	Bowman County 55.2% Slope County 44.8%	44.8%	2
58652	Stark County 72.5% Dunn County 27.5%	27.5%	2
58653	Bowman County 71.1% Harding County, SD 14.8% Slope County 14.2%	28.9%	3
58654	Golden Valley County 79.8% Slope County 20.1%	20.1%	2
58656	Stark County 63.5% Dunn County 36.5%	36.5%	2
58710	McHenry County 40.3% Sheridan County 37.8% Pierce County 21.9%	59.7%	3
58716	McLean County 62.2% Ward County 37.8%	37.8%	2
58718	Ward County 65.1% Mountrail County 31.6% Renville County 3.3%	34.9%	3
58721	Burke County 95.6% Ward County 4.4%	4.4%	2
58723	McLean County 55.4% Sheridan County 43.6% McHenry County 1.0%	44.6%	3
58725	Renville County 61.2% Ward County 38.8%	38.8%	2
58731	McHenry County 90.0% Ward County 10.0%	10.0%	2
58734	Ward County 41.5% Mountrail County 36.6% Renville County 21.9%	58.5%	3
58735	Ward County 59.0% McLean County 41.0%	41.0%	2
58736	McHenry County 73.1% Sheridan County 26.9%	26.9%	2
58740	Renville County 58.3% Ward County 37.0% Bottineau County 2.4% McHenry County 2.3%	41.7%	4
58746	Ward County 47.4% Burke County 32.8% Renville County 19.9%	52.6%	3
58748	Bottineau County 84.5% McHenry County 15.5%	15.5%	2
58750	Bottineau County 61.4% Renville County 38.6%	38.6%	2
58755	Williams County 44.1% Divide County 42.7% Burke County 13.2%	55.9%	3
58756	Ward County 74.8% Mountrail County 21.4% McLean County 3.8%	25.2%	3
58757	Dunn County 79.4% McKenzie County 20.6%	20.6%	2
58758	Sheridan County 67.4% Wells County 17.6% Pierce County 15.0%	32.6%	3
58759	McLean County 53.4% Ward County 46.6%	46.6%	2
58761	Renville County 60.0% Bottineau County 40.0%	40.0%	2
58762	Bottineau County 76.2% McHenry County 23.8%	23.8%	2
58763	Mountrail County 60.4% McKenzie County 39.6%	39.6%	2
58768	McHenry County 50.0% Ward County 50.0%	50.0%	2
58770	Mountrail County 62.8% McLean County 37.3%	37.3%	2
58771	Mountrail County 76.4% Ward County 20.3% McLean County 3.3%	23.6%	3
58773	Burke County 69.3% Mountrail County 30.7%	30.7%	2
58778	McLean County 92.3% McHenry County 7.7%	7.7%	2
58779	McLean County 53.8% Ward County 46.2%	46.2%	2
58782	Renville County 92.7% Bottineau County 7.3%	7.3%	2
58784	Mountrail County 90.3% Burke County 9.7%	9.7%	2
58788	McHenry County 96.9% Pierce County 3.1%	3.1%	2
58789	McHenry County 91.2% Bottineau County 8.8%	8.8%	2
58790	McHenry County 78.7% Ward County 21.3%	21.3%	2
58795	Divide County 53.6% Williams County 46.4%	46.4%	2
58830	Williams County 59.8% Divide County 40.2%	40.2%	2
58845	Williams County 51.4% Divide County 48.6%	48.6%	2
58852	Williams County 79.0% Mountrail County 21.0%	21.0%	2
58854	McKenzie County 92.1% Dunn County 7.9%	7.9%	2
58856	Williams County 66.4% Divide County 33.6%	33.6%	2
59221	Richland County, MT 84.7% McKenzie County 15.3%	15.3%	2
59270	Richland County, MT 60.4% McKenzie County 39.6%	39.6%	2
59275	Sheridan County, MT 76.3% Divide County 23.8%	23.8%	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.

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