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County ZIP codes · Wyoming · FIPS 56025

Natrona County, WY ZIP Codes

Natrona County, Wyoming has 16 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 14 residential and 2 for PO boxes or a single organization. 12 of the residential ones lie mainly in Natrona County and 2 mainly in a neighboring county; 4 cross the county line. Median household income ranges from $67,642 in 82601 (Casper) to $86,638 in 82636 (Evansville) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Natrona County?

82601 · Casper: $68k82604 · Casper: $79k82609 · Casper: $71k82620 · Alcova: –82630 · Arminto: –82635 · Edgerton: $35k82636 · Evansville: $87k82638 · Hiland: –82639 · Kaycee: $72k82642 · Lysite: $80k82643 · Midwest: $78k82644 · Mills: $54k82646 · Natrona: –82648 · Powder River: –8260482639826018264282620826308264882636826388264682601 · Casper: $68k82604 · Casper: $79k82609 · Casper: $71k82620 · Alcova: –82630 · Arminto: –82635 · Edgerton: $35k82636 · Evansville: $87k82638 · Hiland: –82639 · Kaycee: $72k82642 · Lysite: $80k82643 · Midwest: $78k82644 · Mills: $54k82646 · Natrona: –82648 · Powder River: –82604826398260182642826208263082648826368263882601 · Casper: $68k82604 · Casper: $79k82609 · Casper: $71k82620 · Alcova: –82630 · Arminto: –82635 · Edgerton: $35k82636 · Evansville: $87k82638 · Hiland: –82639 · Kaycee: $72k82642 · Lysite: $80k82643 · Midwest: $78k82644 · Mills: $54k82646 · Natrona: –82648 · Powder River: –826048263982601826428262082630826488263682638
The residential ZIP codes of Natrona County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $67,642 and $79,118.

They carry 12 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 14 residential ZIP codes in Natrona County

12 ZIP codes lie mainly in Natrona County; 2 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Natrona County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
82604 Casper 27,487 26 $79k $289k 100%
82601 Casper 26,721 56 $68k $249k 100%
82609 Casper 18,714 287 $71k $294k 100%
82636 Evansville 4,259 32 $87k $299k 98%
82644 Mills 2,098 2,581 $54k $176k 100%
82643 Midwest 267 19 $78k $64k 100%
82620 Alcova 164 0 – – 92%
82638 Hiland 116 2 – – 100%
82635 Edgerton 87 12 $35k – 100%
82648 Powder River 24 0 – – 100%
82630 Arminto no residents 0 – – 100%
82646 Natrona no residents 0 – – 100%

Partly in Natrona County

Residential ZIP codes mainly in another county that reach at least 1% into Natrona County, by their share here
In this county
82642 Lysite 33 0 $80k – 13%
82639 Kaycee 782 1 $72k $194k 6%

Download the 16 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

4 ZIP codes of Natrona County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Natrona County and in the neighboring counties
ZIPIn NatronaElsewhere
8263698%Converse County 2%
826396%Johnson County 94%
8262092%Carbon County 8%
8264213%Fremont County 87%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

PO Box and single-organization ZIP codes

ZIP codes in Natrona County without a residential area (GeoNames postal codes)
ZIPPostal name
82602Casper
82605Casper

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Natrona County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Natrona County starts with 826.

Three-digit prefixes of Natrona County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Natrona County's
PrefixSectional centerHereAll codes
826 Casper, WY (SCF 826) 16 21

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.