Data sources by ZIP codes
I'm looking for a data service that can give me the following data by ZIP code or County, in order of importance:
1. Gross average rental yields
2. Vacancy rates
3. Unemployment rates
4. Median family income
5. General demographic data
Numbers 3, 4, 5 are generally available for free, but I'm having trouble with 1 and 2. I'm willing to pay, but I can't find a good service. RealtyTrac seems to have this data in some of their quarterly reports, but I can't see where it is offered for sale generally.