County ZIP codes · Missouri · FIPS 29103

Knox County, MO ZIP Codes

Knox County, Missouri has 13 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 12 residential and 1 for PO boxes or a single organization. 7 of the residential ones lie mainly in Knox County and 5 mainly in a neighboring county; 9 cross the county line. Median household income ranges from $43,478 in 63447 (La Belle) to $59,891 in 63537 (Edina) (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?

63447 · $44k 63537 · $60k

They carry 12 postal town names.

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

All 12 residential ZIP codes in Knox County

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

Residential ZIP codes mainly in Knox County, largest first; "In this county" is the share of the ZIP's land in the county
						In this county
63537	Edina	2,194	17	$60k	$105k	100%
63563	Rutledge	501	7	$61k	$172k	52%
63446	Knox City	493	5	$61k	–	92%
63531	Baring	393	5	$86k	$167k	54%
63547	Hurdland	377	5	$38k	$78k	89%
63458	Newark	185	7	$69k	$90k	100%
63460	Novelty	151	2	–	$108k	100%

Partly in Knox County

Residential ZIP codes mainly in another county that reach at least 1% into Knox County, by their share here
						In this county
63451	Leonard	177	3	$81k	–	10%
63533	Brashear	1,141	18	$80k	$188k	9%
63447	La Belle	1,060	12	$44k	$94k	4%
63469	Shelbyville	911	7	$56k	$120k	3%
63549	La Plata	2,344	17	$60k	$136k	2%

Download the 13 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?

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

Share of each ZIP code's land in Knox County and in the neighboring counties
ZIP	In Knox	Elsewhere
63549	2%	Macon County 68%; Adair County 29%
63533	9%	Adair County 91%
63447	4%	Lewis County 96%
63469	3%	Shelby County 97%
63563	52%	Scotland County 48%
63446	92%	Lewis County 8%
63531	54%	Scotland County 46%
63547	89%	Adair County 11%
63451	10%	Shelby County 90%

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

PO Box and single-organization ZIP codes

ZIP codes in Knox County without a residential area (GeoNames postal codes)
ZIP	Postal name
63464	Plevna

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Knox County's ZIP codes use 2 prefixes: 634 and 635.

Three-digit prefixes of Knox 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 Knox County's
Prefix	Sectional center	Here	All codes
634	St Louis, MO (SCF 630)	7	42
635	Mid-Missouri, MO (SCF 650)	6	33

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 Knox County?