Frequencies for first 10,000 rows of cntyres variable in natlterr1996 dataset :

NCHS County |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
      07000 |          1        0.01        0.01
      10000 |          1        0.01        0.02
      17000 |          1        0.01        0.03
      31000 |          1        0.01        0.04
      33000 |          1        0.01        0.05
      47000 |          1        0.01        0.06
      52011 |        585        5.85        5.91
      52013 |        373        3.73        9.64
      52016 |        434        4.34       13.98
      52050 |        261        2.61       16.59
      52058 |        576        5.76       22.35
      52065 |      1,054       10.54       32.89
      52999 |      6,701       67.01       99.90
      53999 |          5        0.05       99.95
      59ZZZ |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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