Castle Rock, WA 98611 ZIP Code Profile

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Castle Rock, WA

ZIP Code 98611: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Castle Rock, WA 98611

  • ZIP Code Type: STANDARD
  • County: Cowlitz County
  • Centroid: Latitude 46.287, Longitude -122.9
  • Time Zone: Pacific Time Zone (UTC -8 hours)
  • Observes DST: Yes
  • Businesses Addresses: 173
  • PO Box Addresses: 1,141
  • Residential Addresses: 3,349
    • Multi-Family Addresses: 36
    • Single Family Addresses: 3,313

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

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98611 ZIP Code Map

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Castle Rock, WA 98611 Data & Demographics (As of July 1, 2017)


Total Population 9,518
Daytime Population: Workers 1,325
Daytime Population: Residents 5,405
Total Daytime Population (TDP) 6,730
Ratio TDP/Total Population1 0.71
Population in Households 9,487
Population in Familes 7,918
Population in Group Qrtrs 31
Population Density2 86
Diversity Index3 21


Median Household Income $58,753
Average Household Income $70,424
Per Capita Income $27,328


Total Housing Units 3,952 (100%)
Owner Occupied HU 3,002 (76.0%)
Renter Occupied HU 676 (17.1%)
Vacant Housing Units 274 ( 6.9%)
Median Home Value $220,000
Average Home Value $276,024


Total Households 3,678
Average Household Size 2.58
Family Households 2,702
Average Family Size 3
  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 0.67% 0.67%
Households 0.59% 0.62%
Families 0.53% 0.59%
Median Household Income   2.58%
Per Capita Income   2.59%

Castle Rock, WA 98611 - Peer Comparisons by Rank and Percentile

The table below compares 98611 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 # 236 60th
Population Density # 328 44th
Diversity Index # 488 17th
Median Household Income # 236 60th
Per Capita Income # 336 43rd

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

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