March 18, 2004 CENSUS 2000 SPECIAL TABULATION PRODUCT 64 (STP64) CENSUS TRACT OF WORK BY CENSUS TRACT OF RESIDENCE: 2000 This product was sponsored by the Office of Rural Health Policy of the Department of Health and Human Services. It is used by the Economic Research Service of the Department of Agriculture to define Rural-Urban Commuting Areas. ----------------------------------------------------------------------------- ALL FILES ARE ASCII TEXT FILES: 1. stp64.txt -- DOCUMENTATION FILE YOU ARE NOW READING 2. stp64. -- DATA FILE DESCRIBED BELOW FOR EACH STATE OF WORK = FIPS STATE CODE (01-56) 3. stp64.99 -- DATA FILE DESCRIBED BELOW FOR WORKERS WHO WORKED OUTSIDE THE 50 STATES OR D.C. 4. stp64_us.zip -- ZIP FILE CONTAINING ALL AREAS (01-56, 99) IN ONE FILE 5. st_cnty.txt -- LIST OF STATE AND COUNTY CODES AND NAMES 6. st_place.txt -- LIST OF STATE/PLACE CODES AND NAMES ****** SEE NOTES SECTION AT END OF DOCUMENT ****** ----------------------------------------------------------------------------- RECORD LAYOUT FOR STP64 DATA FILES UNIVERSE: WORKERS 16 YEARS AND OVER WHO WERE EMPLOYED AND AT WORK DURING THE CENSUS 2000 REFERENCE WEEK ("LAST WEEK") BYTE: ITEM DESCRIPTION: --------- ---------------------------------------------------------- 1..2 FIPS STATE CODE OF PLACE OF WORK 01..56 = ALABAMA..WYOMING 99 = NOT IN U.S. STATE OR D.C. 3..5 FIPS COUNTY CODE OF PLACE OF WORK 000 = NOT IN U.S. STATE OR D.C. 001..998 = COUNTY CODE 6..11 CENSUS TRACT CODE OF PLACE OF WORK 000000 = NOT IN U.S. STATE OR D.C. 000100..999998 = LEGAL TRACT CODE RANGE 999999 = TRACT OF WORK MISSING AND NOT ALLOCATED 12..16 FIPS PLACE CODE OF PLACE OF WORK (ALL PLACES) 00000 = NOT IN U.S. STATE OR D.C. 00001..99998 = FIPS PLACE CODE 99999 = NOT IN A PLACE 17..20 CENSUS PLACE CODE OF PLACE OF WORK (ALL PLACES) 0000 = NOT IN U.S. STATE OR D.C. 0001..9998 = CENSUS PLACE CODE 9999 = NOT IN A PLACE 21..22 FIPS STATE CODE OF RESIDENCE 01..56 = ALABAMA..WYOMING 23..25 FIPS COUNTY CODE OF RESIDENCE NNN = COUNTY CODE 26..31 CENSUS TRACT CODE OF RESIDENCE 000100..999998 = LEGAL TRACT CODE RANGE 32..36 FIPS PLACE CODE OF RESIDENCE (ALL PLACES) 99999 = NOT IN A PLACE 37..40 CENSUS PLACE CODE OF RESIDENCE (ALL PLACES) 0001..9998 = CENSUS PLACE CODE 9999 = NOT IN A PLACE 41..46 NUMBER OF WORKERS IN THIS TRACT-TO-TRACT FLOW 47..52 NUMBER OF WORKERS IN THIS FLOW WHO WERE ALLOCATED TO THIS TRACT OF WORK 53..58 NUMBER OF WORKERS IN THIS FLOW WHO WERE ALLOCATED TO THIS PLACE OF WORK 59..64 NUMBER OF WORKERS IN THIS FLOW WHO WERE ALLOCATED TO THIS COUNTY OF WORK NOTES: 1) Rounding - The estimates of workers in this special tabulation have been rounded. Values from 1 through 7 have been rounded to 4. Values of 8 or greater have been rounded to the nearest multiple of 5, unless the estimate already ended in 5 or 0, in which case it was not changed. As a result, estimates derived from these files may not be identical to comparable figures contained in other census products. The greater the number of records from these files that are summed for comparison purposes, the more rounding error there may be and the greater the difference between the estimates from different sources may be. 2) Workers - In this special tabulation, workers are defined as people 16 years and older who were employed and at work during the Census reference week. This is the week prior to when the questionnaire was filled out, for most people the last week of March 2000. Workers include both civilians and people in the Armed Forces, and part-time workers as well as full-time. The concept of a worker excludes people who had a job but did not work during the reference week. Examples of people in the excluded category would be those who didn’t work during the reference week because they were sick, on vacation, laid off, or otherwise absent from work for the week. Nationwide, about 2 percent of employed persons fell into this category. 3) Place of work (POW) allocation - Allocation refers to the processes we use to impute or assign data in cases where data are missing. The POW allocation system used in Census 2000 assigns state, county, and place codes to every worker, but does not always assign a tract code. An extended POW allocation system, designed to impute additional workers to the tract and block level, was developed for the Census Transportation Planning Package 2000. STP64 includes the extended allocation results, but some workers could still not be allocated to a particular census tract. They show up in STP64 as working in tract 999999. They should be considered to be working in the state, county, and place indicated in the record, but their particular tract of work could not be determined nor allocated reliably. It is also important to note that the sub-county codes assigned during regular census processing were sometimes changed by the extended allocation system, in order to place the worker in an appropriate tract. This means that the number of workers working in some places and minor civil divisions derived from the STP64 files may not agree with comparable estimates from other census sources. Lastly, users are advised to examine the number of workers in each flow that were allocated to that particular tract of work (chars. 47-52). Where that number is a large proportion of the total in the flow, users should exercise caution and realize that the allocated data are less accurate and more likely to deviate from actual facts than the directly geocoded data. Additional information: Questions about STP64 or requests for additional information should be referred to the Journey to Work and Migration Statistics Branch at (301) 763-2454.