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County ZIP codes · California · FIPS 06011

Colusa County, CA ZIP Codes

Colusa County, California has 9 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 7 of the residential ones lie mainly in Colusa County and 2 mainly in a neighboring county; 3 cross the county line. Median household income ranges from $61,652 in 95645 (Knights Landing) to $95,122 in 95987 (Williams) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Colusa County?

95645 · Knights Landing: $62k95912 · Arbuckle: $87k95932 · Colusa: $67k95950 · Grimes: –95955 · Maxwell: –95957 · Meridian: $78k95970 · Princeton: $69k95979 · Stonyford: $25k95987 · Williams: $95k95987956459597995912959329595795955959709595095645 · Knights Landing: $62k95912 · Arbuckle: $87k95932 · Colusa: $67k95950 · Grimes: –95955 · Maxwell: –95957 · Meridian: $78k95970 · Princeton: $69k95979 · Stonyford: $25k95987 · Williams: $95k959879564595979959129593295957959559597095645 · Knights Landing: $62k95912 · Arbuckle: $87k95932 · Colusa: $67k95950 · Grimes: –95955 · Maxwell: –95957 · Meridian: $78k95970 · Princeton: $69k95979 · Stonyford: $25k95987 · Williams: $95k95987956459597995912959329595795955
The residential ZIP codes of Colusa 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 $61,652 and $86,457.

They carry 9 postal town names.

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

All 9 residential ZIP codes in Colusa County

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

Residential ZIP codes mainly in Colusa County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
95932 Colusa 7,701 54 $67k $390k 100%
95987 Williams 6,786 21 $95k $389k 100%
95912 Arbuckle 4,855 32 $87k $436k 100%
95955 Maxwell 1,405 11 – $405k 100%
95979 Stonyford 558 2 $25k $184k 100%
95970 Princeton 453 14 $69k $371k 51%
95950 Grimes 287 5 – – 100%

Partly in Colusa County

Residential ZIP codes mainly in another county that reach at least 1% into Colusa County, by their share here
In this county
95645 Knights Landing 1,314 11 $62k $412k 25%
95957 Meridian 680 7 $78k $336k 4%

Download the 9 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?

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

Share of each ZIP code's land in Colusa County and in the neighboring counties
ZIPIn ColusaElsewhere
9564525%Yolo County39%; Sutter County35%
959574%Sutter County96%
9597051%Glenn County49%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Colusa County's ZIP codes use 2 prefixes: 956 and 959.

Three-digit prefixes of Colusa 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 Colusa County's
PrefixSectional centerHereAll codes
956Sacramento, CA (SCF 956)194
959Sacramento, CA (SCF 956)877

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