31 CFR §802.239
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The term urban cluster means a statistical geographic area as identified in the most recent U.S. Census consisting of a densely settled core created from census tracts or blocks and contiguous qualifying territory that together have at least 2,500 individuals but fewer than 50,000 individuals.