ZIP codes and county lines in Nevada

27 of the 182 ZIP code areas in Nevada, or 14.8%, 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: 182
In more than one county: 27
At least 5% in a second county: 19
Cross a state line: 8

How Nevada compares

Nevada ranks 36 of 52 (the 50 states, DC and Puerto Rico) by the share of its ZIP code areas that overlap more than one county. 16 of its counties have at least one split ZIP code area along an edge. 8 of its ZIP code areas also reach into California, Idaho, Oregon and Utah, so a ZIP list that is meant to stop at the state line does not.

Counties with the most split ZIP code areas

Washoe County: 6 ZIP codes shared with another county
Lyon County: 5 ZIP codes shared with another county
Nye County: 5 ZIP codes shared with another county
Humboldt County: 4 ZIP codes shared with another county
Storey County: 4 ZIP codes shared with another county

Every split ZIP code area in Nevada

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
84034	Tooele County, UT 69.8% Juab County, UT 21.1% White Pine County 9.2%	30.3%	3
89010	Esmeralda County 90.3% Mineral County 6.0% Mono County, CA 3.8%	9.8%	3
89019	Clark County 77.6% San Bernardino County, CA 21.5% Inyo County, CA 0.9%	22.4%	3
89049	Nye County 99.6% Esmeralda County 0.4%	0.4%	2
89060	Nye County 98.1% Inyo County, CA 1.9%	1.9%	2
89061	Nye County 95.6% Inyo County, CA 4.4%	4.4%	2
89310	Lander County 94.4% Nye County 5.6%	5.6%	2
89316	Eureka County 76.3% White Pine County 23.7%	23.7%	2
89403	Lyon County 80.4% Storey County 19.6%	19.6%	2
89406	Churchill County 98.6% Lyon County 1.4%	1.4%	2
89408	Churchill County 78.6% Lyon County 21.4%	21.4%	2
89409	Nye County 68.0% Mineral County 32.0%	32.0%	2
89412	Washoe County 91.8% Humboldt County 8.2%	8.2%	2
89414	Humboldt County 73.6% Elko County 26.4%	26.4%	2
89421	Malheur County, OR 61.1% Humboldt County 38.9%	38.9%	2
89434	Storey County 69.1% Washoe County 30.9%	30.9%	2
89439	Washoe County 74.3% Sierra County, CA 25.7%	25.7%	2
89442	Washoe County 99.9% Storey County under 0.1%	under 0.1%	2
89444	Lyon County 78.7% Douglas County 21.3%	21.3%	2
89445	Humboldt County 73.8% Pershing County 26.2%	26.2%	2
89521	Washoe County 57.3% Storey County 42.7%	42.7%	2
89703	Carson City 98.3% Washoe County 1.7%	1.7%	2
89705	Douglas County 95.9% Carson City 4.1%	4.1%	2
89706	Carson City 52.6% Lyon County 47.4%	47.4%	2
89820	Lander County 98.0% Eureka County 2.0%	2.0%	2
89822	Eureka County 93.2% Elko County 6.8%	6.8%	2
89832	Elko County 67.3% Owyhee County, ID 32.7%	32.7%	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.

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