America's dirtiest neighborhoods have been revealed by the number of complaints from residents - and they're shockingly spread across just two cities.Baltimore, , and Sacramento, , have the filthiest zip codes in the nation according to a study by HouseFresh, an indoor air quality company, that analyzed 12.3 million sanitation-related complaints.Seven out of ten of the counties with most complaints are in Baltimore, with six making the top spots. The 21213 zip code at the center of the city receiving the most complaints in the nation - 89,391 per 100k of the population.
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