Population 2000 Population Trends Information on city and county populations, housing, land area, annexations, household size, median income, and military personnel. See the Summary for a description of the method used to develop these estimates. County-level tables are provided in PDF format. This is a long-standing series produced consistently with the shift share method since 1980. A complete description of the methods used in developing these estimates is provided in the Technical notes .
Median age is included in the tables.
Intercensal and postcensal population estimates in an Excel spreadsheet. Population Density Discussion of population density along with current and historical data and maps at several levels of geographic detail U.S. Census Bureau County Profile Accesses population, demographic, and housing information from the 1990 federal census and other information. A variety of income indicators for Washington counties and regions with tables, charts, and discussion. Labor Market Information from the Washington State Employment Security Department, Labor Market and Economic Analysis. Columbia River Economic Development Council Economic development council of Clark County.