The area code for Washington DC is +1 202.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
.
Washington DC has 30 different ZIP codes, starting at 20001 and ending at 20502, at this time. At least a dozen of these ZIP codes are direct descendants of the Zone system used before the 1963 introduction of the ZIP codes. For example a letter sent in 1962 would have been addressed to "Washington DC, 6" in 1964 would have been addressed to "Washington DC, 20006".
These are the zip codes for the places on Whidbey Island98236 - Clinton98239 - Coupeville98249 - Freeland98253 - Greenbank98260 - Langley98277 - Oak Harbor
The ZIP Codes for Washington, D.C., are in the range 20000 through 20099 for homes and businesses, and 20200 through 20599 for government offices.
Northwest Washington DC
Washington, DC
According to Zip express this zip code is for Suffolk, Virginia.
The zip code for Washington DC is 20500 (The District of Columbia is a densely populated area and has 20-30 different zip codes. 20500 may be one of them. However, I received a personal letter from President Obama last week (Jan. 2016) and the zip on the envelope was 20006.)
Washington, DC
1600 Pennsylvania Avenue NW, Washington DC 20500
there are no counties in Washington DC because Washington DC is a city itself.
Since there are thousands of zip codes for locations in the US, you need to consult a zip code directory for a specific zip code. See the link below for the US Postal Service zip code look up.
The area code for Washington DC is +1 202.(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but Japan uses 010, Australia uses 0011, and many other countries use different prefixes.).