Code of Federal Regulations Title 5. Administrative Personnel § 5.591.225 Which CPIs does OPM use?

(a) For the Washington, DC, area—the BLS Consumer Price Index, All Urban Consumers (CPI–U);

(b) For all COLA areas in the State of Alaska—the BLS CPI–U for Anchorage, AK;

(c) For all COLA areas in the State of Hawaii and for Guam and the CNMI—the BLS CPI–U for Honolulu, HI;  and

(d) For Puerto Rico and the U.S. Virgin Islands—the Puerto Rico CPI as produced by the Puerto Rico Department of Work and Human Resources.