County ZIP codes · Kansas · FIPS 20161

Riley County, KS ZIP Codes

Riley County, Kansas has 14 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 13 residential and 1 for PO boxes or a single organization. 8 of the residential ones lie mainly in Riley County and 5 mainly in a neighboring county; 7 cross the county line. Median household income ranges from $51,610 in 66442 (Fort Riley) to $97,846 in 66503 (Manhattan) (Census Bureau, ACS 2020-2024).

ACS2020-24
Census2020

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

How different are its ZIP codes?

66442 · $52k 66503 · $98k

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $54,833 and $68,421.

They carry 11 postal town names.

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

All 13 residential ZIP codes in Riley County

8 ZIP codes lie mainly in Riley County; 5 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Riley County, largest first; "In this county" is the share of the ZIP's land in the county
						In this county
66502	Manhattan	43,693	197	$55k	$223k	60%
66503	Manhattan	17,273	208	$98k	$339k	100%
66442	Fort Riley	16,890	497	$52k	–	61%
66506	Manhattan	3,155	4,456	–	–	100%
66517	Ogden	1,696	926	$68k	$157k	100%
66531	Riley	1,256	36	$79k	$188k	100%
66449	Leonardville	937	14	$90k	$210k	100%
66554	Randolph	770	8	$97k	$194k	100%

Partly in Riley County

Residential ZIP codes mainly in another county that reach at least 1% into Riley County, by their share here
						In this county
67447	Green	207	3	$65k	$156k	41%
66411	Blue Rapids	1,127	10	$57k	$86k	16%
66933	Barnes	345	4	$56k	$86k	5%
66548	Waterville	975	12	$71k	$90k	2%
66441	Junction City	25,828	111	$60k	$170k	1%

Download the 14 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?

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

Share of each ZIP code's land in Riley County and in the neighboring counties
ZIP	In Riley	Elsewhere
66502	60%	Pottawatomie County 21%; Geary County 16%; Wabaunsee County 4%
66441	1%	Geary County 94%; Dickinson County 5%
66442	61%	Geary County 39%
66411	16%	Marshall County 84%
66548	2%	Marshall County 95%; Washington County 3%
66933	5%	Washington County 95%
67447	41%	Clay County 59%

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

PO Box and single-organization ZIP codes

ZIP codes in Riley County without a residential area (GeoNames postal codes)
ZIP	Postal name
66505	Manhattan

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Riley County's ZIP codes use 4 prefixes: 664, 665, 669 and 674.

Three-digit prefixes of Riley 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 Riley County's
Prefix	Sectional center	Here	All codes
664	Kansas City, MO (SCF 640)	4	37
665	Kansas City, MO (SCF 640)	8	44
669	Wichita, KS (SCF 670)	1	34
674	Wichita, KS (SCF 670)	1	58

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

Where are the ZIP codes of Riley County?