The UCs and UAs are both in the UA Census 2000 TIGER/Line files. They share the same field. To determine if the 5-digit code is a UA or a UC, you must look at RT C and look at RT C. Entity Type O refers to both UAs and UCs for 2000 (need to look at those records). Note the UAUGA field. For the UA/UC, look at the LSADC field: Urbanized Areas Code Description Status Title Applicability 75 urbanized area (UA) Urbanized Area urbanized area 76 urban cluster (UC) Urban Cluster urban cluster Hope this helps. This is fully documented in the full UA Census 2000 TIGER/Line file documentation that will be available with the files. Bob LaMacchia -----Original Message----- From: owner-ctpp-news(a)chrispy.net [mailto:owner-ctpp-news@chrispy.net]On Behalf Of Chuck Purvis Sent: Friday, May 03, 2002 12:12 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] Urban Clusters on UA/TIGER/Line TO: CTPP-News This is probably a Bob LaMacchia question (Census Geography) but I'll post it to the CTPP-News since it may be of interest to many MPOs. Are the "Urban Cluster" boundaries included on the soon-to-be-released UA/TIGER files? The Bureau's web page (below) says yes, but I can't find a variable field for urban clusters in the PDF-formatted "record layout." http://www.census.gov/geo/www/tiger/tiger2k/ua_struc.html Or, are urban clusters and urbanized areas use the same "UA" code on the TIGER files? (And, if they use the same UA codes, is there any other indicator to use to separate by UAs from my UCs? I've got 13 urbanized areas and an additional 12 urban clusters in my region, which is manageable if I want a manually separate urbanized area versus urban cluster GIS layers....) (Urban clusters are smaller urban populations of 1,000-49,999 population, and apparently > 1000 persons per square mile. They include such places as Calistoga and Half Moon Bay in the Bay Area, and many of our California state prisons....) (WARNING: ESRI's web site www.geographynetwork.com DOES have TIGER 2000 data files in SHP format, but the "urban areas" that are included on their site are the 1990 URBANIZED AREAS, not the 2000 UAs!!! If ESRI staff are monitoring this listserv, you may want to clarify what is currently available, and when the 2000 UAs will be available on geographynetwork.com.) Thanks in advance! Chuck Purvis, MTC *********************************************** Charles L. Purvis, AICP Senior Transportation Planner/Analyst Metropolitan Transportation Commission 101 Eighth Street Oakland, CA 94607-4700 (510) 464-7731 (office) (510) 464-7848 (fax) www: http://www.mtc.ca.gov/ Census WWW: http://census.mtc.ca.gov/ ***********************************************