Columbia Gas
- Columbia Gas of Pennsylvania and Columbia Gas of Maryland, headquartered in Pittsburgh, PA, is an energy company engaged in all phases of the natural gas business.
- http://www.columbiagaspamd.com

DoYouKnowAGood.com
- Online referral directory providing businesses and consumers information on a company based on research and background checks.
- http://www.doyouknowagood.com

Northside Supplier Network
- Features company directory, business profiles and area resources. Includes newsletter, events calendar and contact details.
- http://www.northsidecommercialhub.com

Pitt Penn Oil Co.
- A full service blender and packager of automotive and household products.
- http://www.pittpenn.com/

Towers Maguire Publishing
- An eclectic mix of titles, many with a focus on local history of various areas. Site has details of each book and information for prospective authors.
- http://www.towersmaguire.com/

H.K. Designs
- Manufacturer of designed metal products for interior and exterior architectural environments. Includes company profile, product details, gallery and contact information.
- http://www.hkdesigns.com/

Pittsburgh Life Sciences Greenhouse
- PLSG invests in and supports the growth of regional life sciences companies. Includes information on partners and members.
- http://www.pittsburghlifesciences.com/

Horizon Press Inc.
- Printing and publishing, including the bi-monthly regional guide Horizons.
- http://www.horizonpressinc.com/

Ameridan Resources
- Advisory services for business mergers and acquisitions. Includes information on the company, services and representative engagements.
- http://www.ameridanres.com/index.cfm

Security Systems of America
- Design, installation and maintenance of security systems. Includes contact details with information on products, services and employment.
- http://www.ssasecurity.com/

Solar Control
- Window tinting services for residential, commercial, and automotive windows.
- http://www.solarcontroltint.com/

Neighbors in the Strip
- Organization to promote economic development opportunities while preserving the personality, integrity and character of the Strip. Includes history, membership details, events, coupons, and area information.
- http://www.neighborsinthestrip.com

AdVision Signs, Inc.
- Specializes in custom signs. Photos, descriptions and contact details.
- http://www.advisionsigns.com

Pittsburgh Business Calendar
- Lists public events pertaining to the Pittsburgh business community.
- http://www.businesscalendar.org/

Current Business-Related Publications about the Pittsburgh Region
- A directory of publications and web sites that provide information about the business conditions of Pittsburgh and its surrounding area.
- http://www.library.cmu.edu/bySubject/Business/LRP/PghReg.html

Digital Dynamics Audio Inc.
- Equipped with the latest technology for digital production and mastering for CD replication.
- http://www.4ddai.com