Our networks are supported by advanced 100% digital switches, with a core fiber network connecting all remote exchanges. We continue to enhance our copper network to increase bandwidth in order to provide additional products and services to our marketable homes. In addition to our copper plant enhancements, we have deployed fiber-optic cable extensively throughout our network, resulting in a 100% fiber backbone network that supports all of the inter-office and host-remote links, as well as the majority of business parks within our service areas. In addition, this fiber infrastructure provides the connectivity required to provide broadband and long-distance services to our residential and commercial customers. Our fiber network utilizes fiber-to-the-home (“FTTH”) and fiber-to-the-node (“FTTN”) networks to offer bundled residential and commercial services.
We operate fiber networks which we own or have entered into long-term leases for fiber network access. At December 31, 2019, our fiber-optic network consisted of approximately 37,500 route-miles, which includes approximately 19,460 route miles of fiber located in the northern New England area, approximately 3,750 miles of fiber network in Minnesota and surrounding areas, approximately 4,270 miles of fiber network in Texas including an expansion into the greater Dallas/Fort Worth market, approximately 1,700 route-miles of fiber-optic facilities in the Pittsburgh metropolitan area, approximately 1,950 miles of fiber network in Illinois, approximately 1,100 route-miles of fiber optic facilities in California that cover large parts of the greater Sacramento metropolitan area and approximately 1,090 route-miles of fiber optic facilities in Kansas City that service the greater Kansas City area, including both Kansas and Missouri. Our remaining network includes approximately 4,190 route-miles spanning across various states including portions of Alabama, Colorado, Florida, Georgia, Massachusetts, New York, Ohio, Pennsylvania and Washington.
We intend to continue to make strategic enhancements to our network including improvements in overall network reliability and increases to our broadband speeds. We offer data speeds of up to 1 Gbps in select markets, and up to 100 Mbps in markets where 1 Gbps is not yet available, depending on the geographical region. As of December 31, 2019, approximately 58% of the homes we serve on our legacy network had availability to broadband speeds of up to 100 Mbps or greater. The majority of the homes in our newly acquired northern New England service territories have availability to broadband speeds of 20 Mbps or less. Over the last two years, we upgraded broadband speeds to more than 750,000 homes and small businesses primarily across the northern New England service area as part of our integration initiatives and in 2019 expanded the availability of our 1 Gig fiber network in select markets. The upgrades enable customers to receive broadband speeds up to three times the speeds previously available.
Through our extensive fiber network, we are also able to support the increased demand on wireless carriers for data bandwidth. In all the markets we serve, we have launched initiatives to support fiber backhaul services to cell sites. As of December 31, 2019, we had 3,493 cell sites in service and an additional 380 future sites pending completion.
Business Strategies
Diversify revenues and increase revenues per customer
We continue to transform our business and diversify our revenue streams as we adapt to changes in the regulatory environment and advances in technology. As a result of acquisitions, our wireless partnerships and increases in the demand for data services, we continue to reduce our reliance on subsidies and access revenue. Utilizing our existing network and strategic network expansion initiatives, we are able to acquire and serve a more diversified business customer base and create new long-term revenue streams such as wireless carrier backhaul services. We will continue to focus on growing our broadband and commercial services through the expansion and extension of our fiber network to communities and corridors near our primary fiber routes where we believe we can offer competitive services and increase market share.
We also continue to focus on increasing our revenue per customer, primarily by improving our data market penetration, increasing the sale of other value-added services and encouraging customers to subscribe to our service bundles.
Improve operating efficiency
We continue to seek to improve operating efficiency through technology, better practices and procedures and through cost containment measures. In recent years, we have made significant operational improvements in our business through the centralization of work groups, processes and systems, which has resulted in significant cost savings and reductions in headcount. Because of these efficiencies, we are better able to deliver a consistent customer experience, service our