- Population
- 311810, 299413
- Area
- 7410, 8313
- Elevation
- 720 m, 710 m
- annual number of weddings
- 1773, 1906, 2016, 1894, 1896, 1986, 1798, 1786, 1766, 1654, 1831, 1953
- contains the administrative territorial entity
- Bolu, Dörtdivan, Gerede, Göynük, Kıbrıscık, Mengen, Mudurnu, Seben district, Yeniçağa, Dörtdivan district, Kıbrıscık district, Mengen district
- female population
- 151401
- life expectancy
- 78.24, 78.33, 78.63, 78.85, 78.66
- local dialing code
- 374
- male population
- 148012
- maximum temperature record
- 39.8
- mean age
- 34.02, 34.27, 34.82, 35.24, 35.41, 35.43, 35.71, 35.98, 36.27, 36.95, 37.07, 37.50
- minimum temperature record
- -31.5
- name in kana
- ボル
- native label
- Bolu ili
- number of households
- 108369
- postal code
- 14000–14999
- suicide rate
- 5.16, 2.92, 3.23, 4.61, 4.93, 4.51, 3.72, 2.65, 3.58, 4.46, 5.07, 4.41
- total fertility rate
- 1.90, 1.86, 1.96, 1.89, 1.97, 1.85, 1.87, 1.80, 1.74, 1.69, 1.58, 1.52
- vehicle registration plate code
- 14
- water as percent of area
- 0.28