[CTPP] Old and New Urban Area Definitions

CTPP Folks: I was looking at a comparison of our 1970, 1980, 1990 and 2000 Urban Area boundary maps and I noticed what appears to be an anomaly to me. (Please don't laugh out loud at the following questions, I was off playing economist and academician for some 20 years between stints in transportation. :-) Why isn't the entire area within the City Limits included in the Urban Area in 2000, when it was in the previous three Censuses? Is this a definitional change that was adopted between 1990 and 2000? If so, what was the rationale for changing? I thought that at least heuristically I understood the 2000 system to be the central city, plus areas such as clusters (connected by hops, etc.) meeting defined population-density requirements; but the map we have before us shows several areas within the City Limits which are not included in the Urban Area boundary. Am I missing something (other than the obvious lack of detailed knowledge :-) in another definition somewhere? Do other jurisdictions have the same problem/issue? I would appreciate any help anyone can provide... Bill Moore, M.ITE, Senior Transportation Planner PACOG - Pueblo MPO - c/o City of Pueblo Department of Community Development 211 E. D Street, P.O. Box 1427 Pueblo, CO 81003 Phone: (719) 583-4485 FAX: (719) 543-0572 E-mail: bmoore(a)ci.pueblo.co.us