Frequencies for first 10,000 rows of zipcodes variable in servarea2016 dataset : Zip Codes | Freq. Percent Cum. ----------------------------------------+----------------------------------- | 9,955 99.55 99.55 08512, 08810, 08816, 08828, 08831, 08.. | 1 0.01 99.56 08520, 08550, 08561, 08620, 08650, 08.. | 1 0.01 99.57 08527, 08533, 08701 | 1 0.01 99.58 16666, 16686, 16829, 16845, 16859, 16.. | 10 0.10 99.68 16677, 16801, 16802, 16803, 16804, 16.. | 7 0.07 99.75 16801, 16802, 16803, 16804, 16805, 16.. | 5 0.05 99.80 20041, 20598 | 2 0.02 99.82 20120, 20121, 20122, 20124, 20151, 20.. | 1 0.01 99.83 22003, 22009, 22015, 22027, 22030, 22.. | 1 0.01 99.84 22003, 22009, 22015, 22027, 22031, 22.. | 1 0.01 99.85 22125, 22191, 22192, 22194 | 2 0.02 99.87 54102, 54104, 54112, 54114, 54139, 54.. | 1 0.01 99.88 54106, 54107, 54111, 54124, 54137, 54.. | 1 0.01 99.89 54106, 54107, 54115, 54130, 54131, 54.. | 1 0.01 99.90 77001, 77002, 77003, 77004, 77005, 77.. | 1 0.01 99.91 77053, 77406, 77407, 77441, 77444, 77.. | 1 0.01 99.92 77301, 77302, 77303, 77304, 77305, 77.. | 1 0.01 99.93 77327, 77328, 77368, 77369, 77533, 77.. | 1 0.01 99.94 77331, 77371 | 1 0.01 99.95 77340, 77341, 77342, 77343, 77344, 77.. | 1 0.01 99.96 77430, 77431, 77511, 77512, 77515, 77.. | 1 0.01 99.97 77510, 77517, 77518, 77539, 77546, 77.. | 1 0.01 99.98 77511, 77512, 77578, 77581, 77583, 77.. | 1 0.01 99.99 77514, 77560, 77580, 77597 | 1 0.01 100.00 ----------------------------------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 9 Oct 2016