Onga's 2026 population is now estimated at 792. In 2014, the population of Onga was 933. Onga experienced a decrease of -11 residents over the past year, marking an annual decline of -1.37%. These population values and projections come from World Population Review Internal Projections .
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| Libreville | 997,953 | 2.72% |
| Port-Gentil | 190,180 | 2.59% |
| Owendo | 138,424 | 4.38% |
| Franceville | 119,970 | 0.63% |
| Oyem | 116,245 | 5.13% |
| Ntoum (Nkan) | 99,520 | 5.13% |
| Moanda | 90,357 | 3.31% |
| Mouila | 69,076 | 5.13% |
| Lambarene | 69,022 | 4.54% |
| Tchibanga | 53,747 | 4.58% |
| Bitam | 53,488 | 5.13% |
| Koulamoutou | 46,358 | 4.66% |
| Akanda | 34,548 | 0% |
| Makokou | 29,973 | 2.91% |
| Okondja | 20,659 | 5.12% |
| Lastoursville | 18,895 | 3.56% |
| Mitzic | 15,339 | 4.4% |
| Gamba (Tsogni) | 13,517 | 2% |
| Akieni | 12,418 | 4.67% |
| Fougamou | 12,112 | 4.11% |
| Mbigou | 10,817 | 4.8% |
| Ndjole | 10,359 | 3.21% |
| Mekambo | 10,025 | 3.1% |
| Lekoni (Leconi) | 9,842 | 2.29% |
| Lebamba | 9,743 | 1.81% |
| Kango | 9,139 | 5.13% |
| Mayumba | 7,886 | 3.22% |
| Bakoumba | 7,748 | 5.13% |
| Ndende | 6,210 | 0.23% |
| Booue | 5,907 | -0.19% |
| Mabanda | 5,183 | 5.11% |
| Mandji | 4,489 | 2.35% |
| Bongoville | 4,291 | 3.82% |
| Ovan | 3,952 | 1.2% |
| Moabi | 3,559 | 0.31% |
| Ngouoni | 3,336 | 1.68% |
| Mounana | 3,088 | -2.65% |
| Minvoul | 2,951 | -1.76% |
| Omboue | 2,831 | 2.68% |
| Iboundji | 2,322 | 2.11% |
| Medouneu | 2,089 | -1.37% |
| Cocobeach | 1,883 | -2.44% |
| Mimongo | 1,740 | -1.58% |
| Pana | 1,681 | 0.48% |
| Boumango | 1,519 | 2.57% |
| Malinga | 1,030 | -0.87% |
| Ndindi | 962 | -1.13% |
| Onga | 792 | -1.37% |
| Aboumi | 587 | -4.4% |
| Moulengui-Binza | 334 | -3.19% |
| Guietsou | 266 | -4.66% |
| Ndzomoe | 43 | 0% |
