Richmond, Virginia:

The Richmond metro area is served by many local television and radio stations. As of 2010[update], the Richmond-Petersburg designated market area (DMA) is the 58th largest in the U.S. with 553,950 homes according to Nielsen Market Research. The major network television affiliates are WTVR-TV 6 (CBS), WRIC-TV 8 (ABC), WWBT 12 (NBC), WRLH-TV 35 (Fox), and WUPV 65 (CW). Public Broadcasting Service stations include WCVE-TV 23 and WCVW 57. There are also a wide variety of radio stations in the Richmond area, catering to many different interests, including news, talk radio, and sports, as well as an eclectic mix of musical interests.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". Per Nielsen, how many homes exist in the Richmond-Petersburg DMA?
553,950