I can't speak on their service, but Assured Property Management, LLC (APM) is one of the largest property management companies for small multifamily around Columbia.

Note, 3 of the 4 largest Pharmaceutical Companies (1000s of employees) are less than an hours drive from Philadelphia. 

No kidding, we just had our largest builder here in Indianapolis announce they are closing up shop.

We are the largest charter member of the National REIA (www.nationalreia.com) in South Florida.Great food, education and networking.  

These are the largest mexican homebuilders and they are distressed.

On the other side of the equation was Bud Zeman, once the largest non-public community owner in America, and Sam Zell, the mastermind who discovered mobile home parks as a real estate investment by reading George Allen's first book: How to Find, Buy, Manage, and Sell a Manufactured Home Community and then hired George as a consultant to teach him what he did not know and then went on to create a Real Estate Investment Trust to finance the purchase of existing communities.

Are Networth Realty and New Western the two big dogs in DFW in terms of volume?   Are there any others?

They are probably one of not the largest turnkey company in the country.

What are the largest property management companies?

Luke may disagree & may have some better knowledge if he owns some rentals here in MB.The positives about MB is that the 2nd largest public university in the state is here, Middle Tennessee State.