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US ZIP Code Profile

ZIP Code 31320
Midway, Georgia

ZIP code 31320 is in Midway, located in Liberty County, Georgia, within the Hinesville metro area. Its 2020 Census population was 9,790. The estimated median adjusted gross income per tax return is $44,979, and about 3% of filers report $200,000 or more.

2020 Population
9,790
Census ZCTA
County
Liberty
FIPS 13179
Median income (est.)
$44,979
IRS SOI 2022
Land Area
117.162 mi²
+ 13.027 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CityMidway, GA
CountyLiberty County (FIPS 13179)
StateGeorgia (FIPS 13)
Metro Area (MSA)Hinesville, GA Metro Area (25980)
Census Region / DivisionSouth Region · South Atlantic Division
Coordinates31.765505, -81.36841
Land / Water Area117.162 mi² land · 13.027 mi² water

02Income & Economics

Distribution of the 4,670 individual tax returns filed in 31320 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
30.0%
$25K–$50K
25.1%
$50K–$75K
17.1%
$75K–$100K
11.1%
$100K–$200K
13.9%
$200K+
2.8%
The $200,000+ bracket accounts for 20% of 31320's total adjusted gross income, from 3% of returns — a concentration that drives the gap between the median ($44,979) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 31320's IRS income metrics, 2020–2022.

Median income (2021→2022)
$44,979
▲ 4.2%
Filers earning $200K+
2.8%
▲ 0.6 pt
Total filers
4,670
▲ 2.6%
GET /zipc/v2/zipcodes/31320/soi?year=… $41K 2020 $43K 2021 $45K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 31320 ZCTA.

2000
6,896
 
2010
8,794
▲ +27.5%
2020
9,790
▲ +11.3%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number125863
City AliasesMidway

06Frequently Asked Questions

What county is ZIP code 31320 in?

ZIP code 31320 is in Liberty County, Georgia (county FIPS code 13179).

What city is ZIP code 31320?

The primary USPS city for 31320 is Midway, GA.

What metro area (MSA) is 31320 in?

31320 is part of the Hinesville, GA Metro Area (MSA code 25980).

What is the population of ZIP code 31320?

The 2020 Census population of 31320 was 9,790 residents.

What is the median income in ZIP code 31320?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 31320 is about $44,979, with around 3% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.