ZIP codes and county lines in Louisiana

149 of the 540 ZIP code areas in Louisiana, or 27.6%, 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: 540
In more than one county: 149
At least 5% in a second county: 108
Cross a state line: 1

How Louisiana compares

Louisiana ranks 28 of 52 (the 50 states, DC and Puerto Rico) by the share of its ZIP code areas that overlap more than one county. 62 of its counties have at least one split ZIP code area along an edge. 1 of its ZIP code areas also reach into Arkansas, so a ZIP list that is meant to stop at the state line does not.

Counties with the most split ZIP code areas

Rapides Parish: 15 ZIP codes shared with another county
Livingston Parish: 12 ZIP codes shared with another county
Tangipahoa Parish: 11 ZIP codes shared with another county
Lafayette Parish: 10 ZIP codes shared with another county
Natchitoches Parish: 10 ZIP codes shared with another county

Every split ZIP code area in Louisiana

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
70030	St. Charles Parish 86.8% Lafourche Parish 13.2%	13.2%	2
70040	Plaquemines Parish 99.2% St. Bernard Parish 0.8%	0.8%	2
70068	St. John the Baptist Parish 93.8% St. Charles Parish 6.2%	6.2%	2
70085	St. Bernard Parish 100.0% Plaquemines Parish under 0.1%	under 0.1%	2
70090	St. James Parish 61.1% St. John the Baptist Parish 38.9%	38.9%	2
70301	Lafourche Parish 97.5% Assumption Parish 1.7% Terrebonne Parish 0.8%	2.5%	3
70339	Assumption Parish 87.0% St. Martin Parish 13.0%	13.0%	2
70343	Lafourche Parish 50.6% Terrebonne Parish 49.4%	49.4%	2
70346	Ascension Parish 79.2% Assumption Parish 20.8%	20.8%	2
70359	Terrebonne Parish 80.5% Lafourche Parish 19.5%	19.5%	2
70364	Terrebonne Parish 58.1% Lafourche Parish 41.9%	41.9%	2
70377	Terrebonne Parish 60.5% Lafourche Parish 39.5%	39.5%	2
70380	Assumption Parish 39.0% St. Mary Parish 32.5% St. Martin Parish 28.5%	61.0%	3
70401	Tangipahoa Parish 100.0% Livingston Parish under 0.1%	under 0.1%	2
70403	Tangipahoa Parish 86.1% Livingston Parish 13.9%	13.9%	2
70422	Tangipahoa Parish 63.7% St. Helena Parish 35.9% Livingston Parish 0.4%	36.3%	3
70427	Washington Parish 90.4% St. Tammany Parish 9.6%	9.6%	2
70431	St. Tammany Parish 93.9% Washington Parish 6.1%	6.1%	2
70433	St. Tammany Parish 93.2% Tangipahoa Parish 6.8%	6.8%	2
70435	St. Tammany Parish 96.0% Tangipahoa Parish 4.0%	4.0%	2
70437	St. Tammany Parish 76.0% Tangipahoa Parish 24.0%	24.0%	2
70438	Washington Parish 96.3% St. Tammany Parish 2.9% Tangipahoa Parish 0.8%	3.7%	3
70443	Tangipahoa Parish 57.1% Livingston Parish 33.1% St. Helena Parish 9.8%	42.9%	3
70444	Tangipahoa Parish 71.3% St. Helena Parish 27.6% Washington Parish 1.1%	28.7%	3
70449	Livingston Parish 99.5% Ascension Parish 0.5%	0.5%	2
70453	St. Helena Parish 94.5% Livingston Parish 5.5%	5.5%	2
70462	Livingston Parish 99.3% Tangipahoa Parish 0.7%	0.7%	2
70466	Tangipahoa Parish 95.2% Livingston Parish 4.8%	4.8%	2
70512	St. Landry Parish 61.0% St. Martin Parish 39.0%	39.0%	2
70515	Acadia Parish 56.8% Evangeline Parish 43.3%	43.3%	2
70517	St. Martin Parish 98.9% Lafayette Parish 1.1%	1.1%	2
70518	Lafayette Parish 51.3% St. Martin Parish 45.5% Iberia Parish 3.2%	48.7%	3
70520	Lafayette Parish 96.7% St. Landry Parish 3.3%	3.3%	2
70525	Acadia Parish 61.0% St. Landry Parish 38.2% Lafayette Parish 0.8%	39.0%	3
70526	Acadia Parish 98.8% Vermilion Parish 1.2%	1.2%	2
70528	Iberia Parish 88.1% Vermilion Parish 11.9%	11.9%	2
70529	Lafayette Parish 97.1% Acadia Parish 2.1% Vermilion Parish 0.8%	2.9%	3
70532	Jefferson Davis Parish 64.0% Allen Parish 36.0%	36.0%	2
70533	Vermilion Parish 99.7% Iberia Parish 0.3%	0.3%	2
70535	Acadia Parish 52.7% St. Landry Parish 26.3% Evangeline Parish 21.1%	47.3%	3
70542	Vermilion Parish 70.0% Cameron Parish 30.0%	30.0%	2
70544	Iberia Parish 52.6% St. Mary Parish 47.4%	47.4%	2
70546	Jefferson Davis Parish 88.7% Acadia Parish 11.3%	11.3%	2
70549	Jefferson Davis Parish 61.6% Cameron Parish 38.0% Calcasieu Parish 0.4%	38.4%	3
70555	Vermilion Parish 97.0% Lafayette Parish 3.0%	3.0%	2
70560	Iberia Parish 97.7% Vermilion Parish 1.1% St. Martin Parish 1.0% Lafayette Parish 0.1%	2.3%	4
70578	Acadia Parish 67.8% Lafayette Parish 18.2% Vermilion Parish 13.9%	32.2%	3
70582	St. Martin Parish 94.4% Iberia Parish 5.6%	5.6%	2
70583	Lafayette Parish 85.5% Acadia Parish 14.5%	14.5%	2
70586	Evangeline Parish 98.3% St. Landry Parish 1.8%	1.8%	2
70589	St. Landry Parish 97.0% Evangeline Parish 3.0%	3.0%	2
70592	Lafayette Parish 74.4% Vermilion Parish 23.7% Iberia Parish 1.9%	25.6%	3
70607	Calcasieu Parish 54.6% Cameron Parish 45.4%	45.4%	2
70630	Cameron Parish 57.3% Calcasieu Parish 42.7%	42.7%	2
70633	Calcasieu Parish 58.3% Beauregard Parish 41.7%	41.7%	2
70634	Beauregard Parish 79.6% Vernon Parish 20.4%	20.4%	2
70637	Allen Parish 52.0% Beauregard Parish 48.0%	48.0%	2
70647	Calcasieu Parish 51.4% Jefferson Davis Parish 48.6%	48.6%	2
70648	Allen Parish 72.6% Jefferson Davis Parish 27.4%	27.4%	2
70656	Vernon Parish 63.9% Allen Parish 23.6% Rapides Parish 12.5%	36.1%	3
70657	Beauregard Parish 67.1% Allen Parish 25.3% Jefferson Davis Parish 7.3% Calcasieu Parish 0.3%	32.9%	4
70661	Calcasieu Parish 68.6% Beauregard Parish 31.4%	31.4%	2
70662	Beauregard Parish 94.7% Allen Parish 5.3%	5.3%	2
70706	Livingston Parish 73.3% St. Helena Parish 26.6%	26.6%	2
70722	East Feliciana Parish 96.5% East Baton Rouge Parish 3.5%	3.5%	2
70729	West Baton Rouge Parish 75.8% Pointe Coupee Parish 24.2%	24.2%	2
70744	Livingston Parish 85.4% St. Helena Parish 14.6%	14.6%	2
70748	East Feliciana Parish 98.7% East Baton Rouge Parish 1.3%	1.3%	2
70757	Iberville Parish 81.6% Pointe Coupee Parish 18.4%	18.4%	2
70764	Iberville Parish 95.1% West Baton Rouge Parish 4.9%	4.9%	2
70767	West Baton Rouge Parish 96.0% Pointe Coupee Parish 4.0%	4.0%	2
70769	Ascension Parish 99.9% Livingston Parish 0.1%	0.1%	2
70774	Ascension Parish 80.9% Livingston Parish 19.1%	19.1%	2
70775	West Feliciana Parish 100.0% East Feliciana Parish under 0.1%	under 0.1%	2
70777	East Feliciana Parish 87.4% East Baton Rouge Parish 12.6%	12.6%	2
70791	East Baton Rouge Parish 96.4% East Feliciana Parish 3.6%	3.6%	2
71001	Bienville Parish 45.0% Claiborne Parish 30.6% Lincoln Parish 24.3%	55.0%	3
71018	Webster Parish 67.6% Bossier Parish 32.4%	32.4%	2
71019	Red River Parish 86.1% Natchitoches Parish 13.9%	13.9%	2
71023	Webster Parish 80.8% Bossier Parish 19.2%	19.2%	2
71024	Webster Parish 65.3% Bienville Parish 34.7%	34.7%	2
71031	Winn Parish 54.8% Natchitoches Parish 45.3%	45.3%	2
71038	Claiborne Parish 99.5% Webster Parish 0.5%	0.5%	2
71039	Webster Parish 63.5% Bienville Parish 36.5%	36.5%	2
71046	De Soto Parish 87.3% Caddo Parish 12.7%	12.7%	2
71051	Bossier Parish 99.2% Caddo Parish 0.8%	0.8%	2
71052	De Soto Parish 95.7% Red River Parish 4.3%	4.3%	2
71055	Webster Parish 87.7% Claiborne Parish 11.5% Bienville Parish 0.8%	12.3%	3
71065	Sabine Parish 84.1% Natchitoches Parish 15.3% De Soto Parish 0.6%	15.9%	3
71067	Bossier Parish 92.3% Webster Parish 7.7%	7.7%	2
71068	Bienville Parish 74.0% Red River Parish 25.9%	25.9%	2
71070	Natchitoches Parish 69.6% Bienville Parish 30.4%	30.4%	2
71071	Webster Parish 80.4% Bossier Parish 19.6%	19.6%	2
71075	Webster Parish 68.4% Bossier Parish 31.6%	31.6%	2
71104	Caddo Parish 95.0% Bossier Parish 5.0%	5.0%	2
71105	Caddo Parish 95.3% Bossier Parish 4.8%	4.8%	2
71107	Caddo Parish 99.2% Bossier Parish 0.8%	0.8%	2
71115	Caddo Parish 58.3% Red River Parish 41.7%	41.7%	2
71220	Morehouse Parish 99.1% Ouachita Parish 0.9%	0.9%	2
71222	Union Parish 73.7% Claiborne Parish 26.3%	26.3%	2
71227	Lincoln Parish 60.3% Jackson Parish 36.8% Ouachita Parish 2.8% Union Parish under 0.1%	39.7%	4
71229	Morehouse Parish 90.8% Ouachita Parish 9.2%	9.2%	2
71232	Madison Parish 46.3% Richland Parish 31.3% Franklin Parish 22.4%	53.8%	3
71234	Union Parish 86.1% Ouachita Parish 7.5% Lincoln Parish 6.3%	13.9%	3
71235	Lincoln Parish 95.6% Union Parish 3.2% Claiborne Parish 1.2%	4.4%	3
71237	West Carroll Parish 48.1% East Carroll Parish 26.0% Richland Parish 16.6% Madison Parish 9.2%	51.9%	4
71238	Jackson Parish 64.8% Ouachita Parish 35.2%	35.2%	2
71251	Jackson Parish 86.2% Bienville Parish 13.8%	13.8%	2
71256	Union Parish 64.1% Claiborne Parish 35.9%	35.9%	2
71264	Morehouse Parish 80.6% Richland Parish 19.4%	19.4%	2
71268	Jackson Parish 57.4% Bienville Parish 42.6%	42.6%	2
71270	Lincoln Parish 61.4% Jackson Parish 38.6%	38.6%	2
71275	Lincoln Parish 76.9% Bienville Parish 23.1%	23.1%	2
71280	Union Parish 72.6% Ouachita Parish 22.0% Morehouse Parish 5.4%	27.4%	3
71282	Madison Parish 99.3% Tensas Parish 0.7%	0.7%	2
71322	Avoyelles Parish 49.5% St. Landry Parish 44.1% Rapides Parish 6.3%	50.5%	3
71323	Avoyelles Parish 94.9% Rapides Parish 5.1%	5.1%	2
71325	Rapides Parish 73.0% Evangeline Parish 27.0%	27.0%	2
71326	Catahoula Parish 73.7% Concordia Parish 26.3%	26.3%	2
71328	Rapides Parish 83.7% Avoyelles Parish 16.3%	16.3%	2
71343	Catahoula Parish 64.3% Concordia Parish 18.3% LaSalle Parish 17.4%	35.7%	3
71351	Avoyelles Parish 99.2% Rapides Parish 0.8%	0.8%	2
71356	St. Landry Parish 87.3% Avoyelles Parish 12.7%	12.7%	2
71360	Rapides Parish 88.4% Avoyelles Parish 10.5% Grant Parish 1.1%	11.6%	3
71362	Avoyelles Parish 78.1% St. Landry Parish 21.9%	21.9%	2
71367	Evangeline Parish 93.2% Rapides Parish 6.8%	6.8%	2
71403	Vernon Parish 97.6% Sabine Parish 2.4%	2.4%	2
71404	Winn Parish 75.8% Grant Parish 24.2%	24.2%	2
71418	Caldwell Parish 84.1% Richland Parish 7.0% Catahoula Parish 5.9% Ouachita Parish 3.0% Franklin Parish under 0.1%	15.9%	5
71419	Sabine Parish 75.8% De Soto Parish 24.2%	24.2%	2
71423	Grant Parish 96.4% Rapides Parish 3.6%	3.6%	2
71427	Rapides Parish 60.3% Natchitoches Parish 39.7%	39.7%	2
71429	Sabine Parish 98.0% Vernon Parish 2.0%	2.0%	2
71432	Grant Parish 95.1% Winn Parish 4.9%	4.9%	2
71435	Caldwell Parish 83.8% Catahoula Parish 13.4% LaSalle Parish 2.3% Winn Parish 0.4%	16.2%	4
71438	Vernon Parish 70.3% Rapides Parish 29.7%	29.7%	2
71439	Vernon Parish 67.0% Sabine Parish 33.0%	33.0%	2
71441	Caldwell Parish 69.2% LaSalle Parish 30.8%	30.8%	2
71447	Rapides Parish 56.6% Natchitoches Parish 42.9% Vernon Parish 0.5%	43.4%	3
71450	Natchitoches Parish 79.0% Sabine Parish 21.0%	21.0%	2
71454	Grant Parish 60.8% Winn Parish 39.2%	39.2%	2
71455	Natchitoches Parish 85.0% Rapides Parish 15.0%	15.0%	2
71457	Natchitoches Parish 95.8% Winn Parish 4.2%	4.2%	2
71463	Allen Parish 59.9% Evangeline Parish 29.6% Rapides Parish 10.5%	40.1%	3
71465	LaSalle Parish 73.2% Winn Parish 17.2% Caldwell Parish 7.3% Catahoula Parish 2.3%	26.8%	4
71467	Grant Parish 99.2% Rapides Parish 0.8%	0.8%	2
71469	Natchitoches Parish 84.4% Sabine Parish 15.6%	15.6%	2
71479	Winn Parish 68.9% LaSalle Parish 31.1%	31.1%	2
71749	Union County, AR 98.2% Claiborne Parish 1.7% Union Parish 0.1%	1.8%	3

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

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