... (all) 42,682 3 ,56 8,7 85 0 98,484 84 676 17ZIP codes (areal) 29,483 3,268,020 0.011 18 ,55 5 111 380 40 .5 Census tract 61,386 3,779 ,51 8 0 61 ,58 6 62 59 3 2.2County 3141 3 ,56 0 ,53 6 1.8 156 ,741 1134 3777 ... 619State 51 3 ,59 6,102 69 58 0,4 35 67,920 86,127 55 ,942 Population ZIP codes (areal) 29,466 248,709,873 0 112,167 8441 12,316 27 85 Census tract 61, 255 248,709,873 0 71,872 4060 2394 3 755 County ... into threesets of spatial units: (1) 1 . 5- mi buffers along major highways; (2) 1. 5- , 3. 0-, and 4 . 5- mi circular buffers around major population centers; (3) 45 sectoral patterns onfour concentric...