County ZIP codes · Illinois · FIPS 17069

Hardin County, IL ZIP Codes

Hardin County, Illinois has 6 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 5 residential and 1 for PO boxes or a single organization. 3 of the residential ones lie mainly in Hardin County and 2 mainly in a neighboring county; 3 cross the county line.

ACS2020-24
Census2020

Where are the ZIP codes of Hardin County?

The residential ZIP codes of Hardin 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).

All 5 residential ZIP codes in Hardin County

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

Residential ZIP codes mainly in Hardin County, largest first; "In this county" is the share of the ZIP's land in the county
						In this county
62931	Elizabethtown	1,348	14	$50k	$105k	92%
62982	Rosiclare	1,016	131	$44k	$61k	100%
62919	Cave In Rock	819	17	$64k	$162k	100%

Partly in Hardin County

Residential ZIP codes mainly in another county that reach at least 1% into Hardin County, by their share here
						In this county
62947	Herod	408	6	$47k	$147k	34%
62938	Golconda	2,622	16	$64k	$114k	4%

Download the 6 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 Hardin County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Hardin County and in the neighboring counties
ZIP	In Hardin	Elsewhere
62938	4%	Pope County 94%; Massac County 2%
62931	92%	Gallatin County 8%
62947	34%	Pope County 58%; Saline County 8%

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

PO Box and single-organization ZIP codes

ZIP codes in Hardin County without a residential area (GeoNames postal codes)
ZIP	Postal name
62955	Karbers Ridge

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Hardin 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 Hardin County starts with 629.

Three-digit prefixes of Hardin 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 Hardin County's
Prefix	Sectional center	Here	All codes
629	St Louis, MO (SCF 630)	6	83

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