<p> File Layouts for Data Release of 2010 Census Mail Response and Mail Return Rate</p><p>Table 1: Layout of State, County, and Tract Level Mail Response, Mail Return, and Undeliverable as Addressed Rate Excel Files Name Description COLBLKST State code STATE State name COLBLKCOU County code (blank on state files) COUNTY County name (blank on state files) TRACT Tract code (blank on state and county files) RESPONSE_IQ_NRFU Initial questionnaire mail response rate when NRFU universe was determined (April 19). RESPONSE_RQ_NRFU Replacement questionnaire mail response rate when NRFU universe was determined (April 19). RESPONSE_NRFU Mail response rate (initial + replacement) when NRFU universe was determined (April 19). RESPONSE_IQ_FINAL Final initial questionnaire mail response rate. RESPONSE_RQ_FINAL Final replacement questionnaire mail response rate. RESPONSE_FINAL Final mail response rate (initial + replacement). RETURN_IQ_NRFU Initial questionnaire mail return rate when NRFU universe was determined (April 19). RETURN_RQ_NRFU Replacement questionnaire mail return rate when NRFU universe was determined (April 19). RETURN_NRFU Mail return rate (initial + replacement) when NRFU universe was determined (April 19). RETURN_IQ_FINAL Final initial questionnaire mail return rate. RETURN_RQ_FINAL Final replacement questionnaire mail return rate. RETURN_FINAL Final mail return rate (initial + replacement). UAA_IQ_NRFU Initial questionnaire undeliverable as addressed rate when NRFU universe was determined. UAA_RQ_NRFU Replacement questionnaire undeliverable as addressed rate when NRFU universe was determined. UAA_NRFU Undeliverable as addressed rate when NRFU universe was determined. UAA_IQ_FINAL Final initial questionnaire undeliverable as addressed rate. UAA_RQ_FINAL Final replacement questionnaire undeliverable as addressed rate. UAA_FINAL Final undeliverable as addressed rate. RETURN_SF_2000_NRFU Census 2000 short form mail return rate when the NRFU universe was determined. RETURN_SF_2000_FINA Final Census 2000 short form mail return rate. L RETURN_2000_NRFU Census 2000 mail return rate (short form + long form) when the NRFU universe was determined. RETURN_2000_FINAL Final Census 2000 mail return rate (short form + long form).</p><p>Table 2: Layout of State, County, and Tract Level Mail Response, Mail Return, and Undeliverable as Addressed Rate Comma-Delimited (.csv) Files Name Description COLBLKST State code COLBLKCOU County code (blank on state files) TRACT Tract code (blank on state and county files) RETURN_2000_NRFU Census 2000 mail return rate (short form + long form) when the NRFU universe was determined. RETURN_2000_FINAL Final Census 2000 mail return rate (short form + long form). RESPONSE_IQ_NRFU Initial questionnaire mail response rate when NRFU universe was determined (April 19). RETURN_IQ_NRFU Initial questionnaire mail return rate when NRFU universe was determined (April 19). RESPONSE_RQ_NRFU Replacement questionnaire mail response rate when NRFU universe was determined (April 19). RETURN_RQ_NRFU Replacement questionnaire mail return rate when NRFU universe was determined (April 19). RESPONSE_NRFU Mail response rate (initial + replacement) when NRFU universe was determined (April 19). RETURN_NRFU Mail return rate (initial + replacement) when NRFU universe was determined (April 19). UAA_IQ_NRFU Initial questionnaire undeliverable as addressed rate when NRFU universe was determined. UAA_RQ_NRFU Replacement questionnaire undeliverable as addressed rate when NRFU universe was determined. UAA_NRFU Undeliverable as addressed rate when NRFU universe was determined. RESPONSE_IQ_FINAL Final initial questionnaire mail response rate. RETURN_IQ_FINAL Final initial questionnaire mail return rate. RESPONSE_RQ_FINAL Final replacement questionnaire mail response rate. RETURN_RQ_FINAL Final replacement questionnaire mail return rate. RESPONSE_FINAL Final mail response rate (initial + replacement). RETURN_FINAL Final mail return rate (initial + replacement). UAA_IQ_FINAL Final initial questionnaire undeliverable as addressed rate. UAA_RQ_FINAL Final replacement questionnaire undeliverable as addressed rate. UAA_FINAL Final undeliverable as addressed rate. STATE State name RETURN_SF_2000_NRFU Census 2000 short form mail return rate when the NRFU universe was determined. RETURN_SF_2000_FINA Final Census 2000 short form mail return rate. L COUNTY County name (blank on state files)</p>