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31561
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  2. ZIP Codes
  3. ZIP Code 31561
Georgia (GA)Glynn CountyBrunswick-St. Simons

ZIP Code 31561 — Sea Island, GA

Glynn County * Brunswick-St. Simons metro

Compare

96

Population

$250K

Median income

per household

$2M

Home value

0.0%

Poverty rate

What stands out

  • Median household income: $250K (top 10% vs US ZIP codes).
  • Median home value: $2M (top 10% vs US ZIP codes).
  • Poverty rate: 0.0% (low poverty; bottom 10% vs US ZIP codes).

Categories vs U.S.

Economy

4 of 4 metrics better than U.S. benchmarks

Housing stretch: typical home values are about 8.0× the median household income.

Median household income

$250K

U.S.

$81K

Per-capita income

$191.9K

U.S.

$45K

Median home value

$2M

U.S.

$333K

Housing stress

Affordability Ratios

Home-Value-to-Income

8.0×

Above typical 3-5x ratio

Income distribution

Share of households by income bracket (ACS).

< $50k
0.0%
$50–100k
0.0%
$100–200k
47.5%
$200k+
52.5%

Health

5 of 6 available metrics better than U.S.

CDC PLACES modeled ZCTA-level estimates (adult prevalence).

Obesity

25.4%

U.S.

33.3%

Diabetes

13.5%

U.S.

12.0%

Current smoking

7.9%

U.S.

13.1%

Connectivity

2 of 3 metrics better than U.S.

Best available speed

1,000Mbps

Gigabit speeds reported

100+ Mbps coverage

97.0%

U.S.

85.3%

Gigabit ready

28.8%

U.S.

8.6%

5G available

63.3%

U.S.

77.4%

Learning

Education metrics come from ACS 5-year estimates for ZIP Code Tabulation Areas (ZCTAs).

Bachelor's degree+ (age 25+)

100.0%

U.S.

35.7%

A high share of adults with a bachelor's degree or higher often correlates with higher-paying jobs and knowledge-economy industries.

ZIP-level estimates can have higher margins of error than county/state totals; treat small differences as noise.

School districts

Glynn County School District

Map

ZIP 31561

Sea Island, GA

Population

96

Area

4.7 sq mi

Density

20.3/sq mi

Neighbors

31522
More Details

Census Tracts

1 tracts overlap this ZIP. Hover over segments to explore.

100%

Tract 3.01

100%

Total tracts: 1Coverage: 100.0%

Representation

U.S. House

ZIP codes can span multiple congressional districts. Overlap percentages are approximate by land area. Verify by address.

100%

GA-1

100%

Districts: 1Coverage: 100.0%

Data freshness

ACS 5-Year
2020–2024
CDC PLACES
2025
Broadband
2020-12
Mobile
2025-11-24
Page Updated
2026-02-23

Release schedule and upstream dates: Sources.

Data sources

US Census Bureau (ACS 5-year)HUD USPS ZIP crosswalkUS Census TIGER/Line (geometry inputs)US Census TIGER/Line (school districts)US Census Bureau (ZCTA-to-tract relationship, 2020)US Census Bureau (2020 ZCTA-to-congressional-district relationship file, CD119)CDC PLACES (ZCTA)FCC (Form 477 broadband)FCC (Mobile Broadband Data Collection)

Derived statistics

  • ZIP pages use Census ZIP Code Tabulation Areas (ZCTAs), not USPS delivery routes.
  • Population density is computed as population ÷ land area.
  • Overlap percentages (tracts and districts) are derived from map geometry and are approximate.

Data accuracy & methodology

ZIP pages combine 2020–2024 ACS 5-year ZCTA estimates with other public datasets when available (see Sources). Connectivity metrics use FCC coverage data, not ACS. ZIP-level estimates can have higher margins of error than county/state totals; treat small differences as statistical noise rather than precise changes.