Demographic information for the area can tell you much of what you need to know about the local economy.

There is a lot of movement of demographics in the areas.

You can see more stats here; https://www.clrsearch.com/64128-Demographics/Household-Income

Some demographic information for you Port Richmond (19134) Population in 2000 - 57,922, Population in 2010 - 60,675, Population in 2017 - 62,861Population change since 00' (+8.5%), Population change since 10' (+4%)Median Household Income in 2000 - $20,903, Median Household Income in 2017 - $27,546Median Household Income change since 00' (+32%)Percent of Renters (50%)Point Breeze (19145)Population in 2000 - 45,647, Population in 2010 - 47,261, Population in 2017 - 46,311Population change since 00' (+1.5%), Population change since 10' (-2%)Median Household Income in 2000 - $26,655, Median Household Income in 2017 - $39,374Median Household Income change since 00' (+48%)Percent of Renters (40%)Point Breeze (19146)Population in 2000 - 35,783, Population in 2010 - 35,113, Population in 2017 - 38,486Population change since 00' (+7.6%), Population change since 10' (+10%)Median Household Income in 2000 - $24,803, Median Household Income in 2017 - $58,784Median Household Income change since 00' (+137%)Percent of Renters (49%)Source: US Census Bureau

Demographics, economically, socially, etc... are ideal.  

What are some of the best websites to get information on demographics?

They are not only very affordable and cash flow well, but they have strong economic and demographic trends such as population growth, job growth and modern, diverse economies. 

These materials can be sent out periodically within a X mile radius of your recently closed deal.Facebook ads are very inexpensive and allow you to target specific demographics.

Although depending on the demographics on your area (and size of your personal balance sheet), you could go in the opposite direction. 

Similarly, "rules" that apply in Cali are not even close to those in TX or FL.Would be helpful if you provided location, size / type of property and demographics.