Rock Island, WA 98850 ZIP Code Profile

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Rock Island, WA

ZIP Code 98850: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Rock Island, WA 98850

  • ZIP Code Type: STANDARD
  • County: Douglas County
  • Centroid: Latitude 47.37, Longitude -120.139
  • Time Zone: Pacific Time Zone (UTC -8 hours)
  • Observes DST: Yes
  • Businesses Addresses: 36
  • PO Box Addresses: 369
  • Residential Addresses: 359
    • Multi-Family Addresses: 0
    • Single Family Addresses: 359

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.


98850 ZIP Code Map

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Rock Island, WA 98850 Data & Demographics (As of July 1, 2017)


Total Population 1,615
Daytime Population: Workers 334
Daytime Population: Residents 789
Total Daytime Population (TDP) 1,123
Ratio TDP/Total Population1 0.70
Population in Households 1,615
Population in Familes 1,375
Population in Group Qrtrs 0
Population Density2 30
Diversity Index3 79


Median Household Income $49,480
Average Household Income $69,221
Per Capita Income $23,102


Total Housing Units 607 (100%)
Owner Occupied HU 352 (58.0%)
Renter Occupied HU 187 (30.8%)
Vacant Housing Units 68 (11.2%)
Median Home Value $197,321
Average Home Value $344,531


Total Households 539
Average Household Size 3.0
Family Households 392
Average Family Size 4
  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 0.7% 0.71%
Households 0.52% 0.62%
Families 0.47% 0.56%
Median Household Income   2.16%
Per Capita Income   3.72%

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, 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 # 382 35th
Population Density # 392 33rd
Diversity Index # 31 95th
Median Household Income # 385 34th
Per Capita Income # 470 20th

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

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