Section 102-83.65 - What is a principal city?(a) A principal city is an incorporated place or census designated place within a CBSA that meets certain employment and population-based criteria. Major metropolitan areas typically have several principal cities.(b) The principal city designation is established by OMB pursuant to the Standards for Delineating Metropolitan and Micropolitan Statistical Areas, as updated periodically and published in the Federal Register, pursuant to 31 U.S.C. 1104(d) and 44 U.S.C. 3504(e) . OMB regularly publishes an updated list of Principal Cities (OMB Bulletin No. 20-01, and succeeding). In this part, the principal city designation is used to help the Federal agency focus local consultation and engagement.