Rock Island, WA 98850 ZIP Code Profile

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Rock Island, WA

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ZIP Code 98850: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Rock Island, WA 98850

  • ZIP Code Type: STANDARD
  • Businesses Addresses: 44
  • Single Family Addresses: 327
  • Multi-Family Addresses: 0
  • County: Douglas County
  • Centroid: Latitude 47.37, Longitude -120.139
  • Time Zone: Pacific Time Zone (UTC -8 hours)
  • Observes DST: Yes

Neighborhood 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 certain data.


98850 ZIP Code Map

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Rock Island, WA 98850 Data & Demographics (As of July 1, 2016)


Total Population 1,702
Population in Households 1,702
Population in Familes 1,450
Population in Group Qrtrs 0
Population Density1 40
Diversity Index2 78


Total Households 569
Average Household Size 2.99
Family Households 413
Average Family Size 4


Total Housing Units 645 (100%)
Owner Occupied HU 374 (58.0%)
Renter Occupied HU 195 (30.2%)
Vacant Housing Units 76 (11.8%)
Median Home Value $183,621
Average Home Value $327,607


Median Household Income $46,347
Average Household Income $63,802
Per Capita Income $21,330
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.87% 0.82%
Households 0.66% 0.73%
Families 0.55% 0.72%
Median Household Income   -0.28%
Per Capita Income   1.65%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

Rock Island, WA 98850 - Peer Comparisons by Rank and Percentile

The table below compares 98850 to the other 585 ZIP Codes in Washington by rank and percentile using July 1, 2016 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 # 378 36th
Population Density1 # 376 36th
Diversity Index2 # 34 95th
Median Household Income # 380 35th
Per Capita Income # 491 16th

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