Frequencies for first 10,000 rows of cntyres variable in natlterr1999 dataset :

NCHS County |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
      10000 |          2        0.02        0.02
      16000 |          1        0.01        0.03
      31000 |          1        0.01        0.04
      33000 |          1        0.01        0.05
      39000 |          1        0.01        0.06
      44000 |          1        0.01        0.07
      47000 |          1        0.01        0.08
      52011 |        586        5.86        5.94
      52013 |        379        3.79        9.73
      52016 |        453        4.53       14.26
      52050 |        211        2.11       16.37
      52058 |        499        4.99       21.36
      52065 |      1,070       10.70       32.06
      52999 |      6,790       67.90       99.96
      53999 |          1        0.01       99.97
      59ZZZ |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015