Umatilla County Special Library District is supported by a permanent tax base at a rate of $0.3682 per $1,000 of assessed property value within the District boundaries in the County. This tax base was created when voters approved a tax base measure in 1990.

In addition to taxes, the District receives monies from interest earnings, agreements with other government entities, and private and public grants.

For detailed information about the District's revenues and expenditures, please refer to the budgets.