Table 1 Structure of Summary File 1 (SF1):
Census of Population and Housing, 2000
| Card Number | Number of data Items | Starting Matrix Number | Ending Matrix Number | Lowest Level of Geography |
| 00 Geographic Header File | ||||
| 01 [See Note 1] | 222 | P1 | P5 | Block |
| 02 | 238 | P6 | P18 | Block |
| 03 | 236 | P19 | P33 | Block |
| 04 | 149 | P34 | P45 | Block |
| 05 | 245 | P12A | P12E | Block |
| 06 | 241 | P12F | P16I | Block |
| 07 | 234 | P17A | P27C | Block |
| 08 | 247 | P27D | P28E | Block |
| 09 | 244 | P28F | P30H | Block |
| 10 | 229 | P30I | P34I | Block |
| 11 | 180 | P35A | P35I | Block |
| 12 | 235 | PCT1 | PCT9 | Census Tract |
| 13 | 45 | PCT10 | PCT11 | Census Tract |
| 14 | 209 | PCT12 | PCT12 | Census Tract |
| 15 | 196 | PCT13 | PCT17 | Census Tract |
| 16 | 209 | PCT12A | PCT12A | Census Tract |
| 17 | 209 | PCT12B | PCT12B | Census Tract |
| 18 | 209 | PCT12C | PCT12C | Census Tract |
| 19 | 209 | PCT12D | PCT12D | Census Tract |
| 20 | 209 | PCT12E | PCT12E | Census Tract |
| 21 | 209 | PCT12F | PCT12F | Census Tract |
| 22 | 209 | PCT12G | PCT12G | Census Tract |
| 23 | 209 | PCT12H | PCT12H | Census Tract |
| 24 | 209 | PCT12I | PCT12I | Census Tract |
| 25 | 209 | PCT12J | PCT12J | Census Tract |
| 26 | 209 | PCT12K | PCT12K | Census Tract |
| 27 | 209 | PCT12L | PCT12L | Census Tract |
| 28 | 209 | PCT12M | PCT12M | Census Tract |
| 29 | 209 | PCT12N | PCT12N | Census Tract |
| 30 | 209 | PCT12O | PCT12O | Census Tract |
| 31 | 245 | PCT13A | PCT13E | Census Tract |
| 32 | 235 | PCT13F | PCT15C | Census Tract |
| 33 | 225 | PCT15D | PCT17B | Census Tract |
| 34 | 225 | PCT17C | PCT17E | Census Tract |
| 35 | 225 | PCT17F | PCT17H | Census Tract |
| 36 | 75 | PCT17I | PCT17I | Census Tract |
| 37 | 217 | H1 | H20 | Block |
| 38 | 207 | H11A | H15I | Block |
| 39 | 171 | H16A | H16I | Block |
Note 1: This is the number in field CIFSN, beginning in position 17.
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