Arlington County’s libraries offer more than books, including public Internet access, art exhibits, special events and lecture series and meeting rooms. Note that Columbia Pike Library is not included because that branch is part of the Career Center facility managed by Arlington Public Schools, and that branch has no separate utility meters. Similarly, the Aurora Hills Library is included in the Aurora Hills Community & Senior Center, which is shown under Community Centers.
Libraries: Site Energy Use Intensity (kBTU/ft²), 2007 and 2017
| Facility | 2007 | 2017 |
| Central Library | 88.4 | 60.0 |
| Cherrydale Branch Library | 72.8 | 41.3 |
| Glencarlyn Branch Library | 90.7 | 60.6 |
| Shirlington Branch Library/Signature Theatre | 106.9 | 99.9 |
| Westover Branch Library | 50.5 |
See this page for an explanation of the building and energy details provided.