Sea Island, GA 31561 ZIP Code Profile

Related Place Profiles:
Brunswick, GA | Sea Island, GA

ZIP Code 31561: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Sea Island, GA 31561

Acceptable Alternative
Brunswick, GA 31561

  • ZIP Code Type: PO BOX
  • County: Glynn County
  • Centroid: Latitude 31.206, Longitude -81.33
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes
  • Businesses Addresses: 55
  • PO Box Addresses: 474
  • Residential Addresses: 1
    • Multi-Family Addresses: 0
    • Single Family Addresses: 1

The ZIP Code maps and database are updated 4 times per year.
Database updated: May 1, 2018, Maps updated: February 1, 2018.

EXTREMELY LOCAL Demographic Data

Address Based Hyperlocal Data Input an address and get data & demographics for the pertinent census block group (CBG), a searchable map and a customized directory. The CBG is the smallest geographical unit used by the Census Bureau for reporting demographic data.


31561 ZIP Code Map

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Sea Island, GA 31561 Data & Demographics (As of July 1, 2017)


Total Population 248
Daytime Population: Workers 1,647
Daytime Population: Residents 178
Total Daytime Population (TDP) 1,825
Ratio TDP/Total Population1 7.36
Population in Households 248
Population in Familes 202
Population in Group Qrtrs 0
Population Density2 67
Diversity Index3 16


Median Household Income $97,057
Average Household Income $140,116
Per Capita Income $74,013


Total Housing Units 539 (100%)
Owner Occupied HU 112 (20.8%)
Renter Occupied HU 19 ( 3.5%)
Vacant Housing Units 408 (75.7%)
Median Home Value $410,000
Average Home Value $581,027


Total Households 131
Average Household Size 1.89
Family Households 87
Average Family Size 2
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.75% 1.03%
Households 0.76% 1.05%
Families 0.49% 0.9%
Median Household Income   1.39%
Per Capita Income   1.38%

Sea Island, GA 31561 - Peer Comparisons by Rank and Percentile

The table below compares 31561 to the other 710 ZIP Codes in Georgia by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 683 4th
Population Density # 403 43rd
Diversity Index # 672 5th
Median Household Income # 12 98th
Per Capita Income # 4 100th

Additional comparisons and rankings can be made with a VERY EASY TO USE Georgia Census Data Comparison Tool.

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