There are 100 Mailing Services in District of Columbia , District of Columbia, serving a population of 672,391 people in an area of 62 square miles. There is 1 Mailing Service per 6,723 people, and 1 Mailing Service per square mile.
In District of Columbia, District of Columbia is ranked 1st of 1 counties in Mailing Services per capita, and 1st of 1 counties in Mailing Services per square mile.