Frequencies for first 10,000 rows of county variable in uswbosingleages dataset :

County FIPS |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
      01001 |        363        3.63        3.63
      01003 |        432        4.32        7.95
      01005 |        362        3.62       11.57
      01007 |        351        3.51       15.08
      01009 |        339        3.39       18.47
      01011 |        346        3.46       21.93
      01013 |        355        3.55       25.48
      01015 |        430        4.30       29.78
      01017 |        365        3.65       33.43
      01019 |        345        3.45       36.88
      01021 |        351        3.51       40.39
      01023 |        346        3.46       43.85
      01025 |        358        3.58       47.43
      01027 |        357        3.57       51.00
      01029 |        331        3.31       54.31
      01031 |        372        3.72       58.03
      01033 |        378        3.78       61.81
      01035 |        347        3.47       65.28
      01037 |        361        3.61       68.89
      01039 |        356        3.56       72.45
      01041 |        357        3.57       76.02
      01043 |        343        3.43       79.45
      01045 |        434        4.34       83.79
      01047 |        394        3.94       87.73
      01049 |        355        3.55       91.28
      01051 |        371        3.71       94.99
      01053 |        484        4.84       99.83
      01055 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 2 Jan 2018