The channels that you can receive in the 20002 or 20003 zip codes are:

STATION NETWORK CHANNEL NUMBER
WRCD NBC 4.1
WRCDT2 NBC Weather 4.2
WRCDT3 NBC Universal Sports 4.3
WTTG FOX 5.1
WJLA ABC 7.1
WJLADT2 ABC Weather 7.2
WJLADT3 RTV 7.3
WUSA CBS 9.1
WUSADT2 CBS Weather 9.2
WFDC Univision 14.1
WDCA MyDC 20.1
WETA PBS 26.1
WETADT2 CreateTV 26.2
WETADT3 WETA Kids 26.3
WETADT4 WETA 4 26.4
WNVC International News 30.1-.5
WDCW CW 50.1
WDCWDT2 ThisTV 50.2
WPXW ION 66.1
WPXWDT2 QUBO 66.2
WPXWDT3 IONLife 66.3