Frequencies for first 10,000 rows of zipcode variable in planxw2018 dataset :

                              Zip Codes |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                  00000 |     10,000      100.00      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 Dec 2017