If you want to purchase an affordable home, there are a few neighborhoods to avoid.

New York County and San Francisco County predictably top the list, according to data from the U.S. Census Bureau comparing median home values against median household income. The median home price in New York County was 11.6 times the median income ($849,000 versus $73,000) and 9.8 times in San Francisco Count ($800,000 versus $81,000). Several of the other least affordable places were in California, including Marin County, San Mateo County and Santa Clara. Arlington, Va. Honolulu, Hawaii where the median home value is 7.78 times larger than the median income of $74,000 at $580,000 also topped the charts for least affordable homes.