Gunnedah Population, It is 475 kms from Sydney. Since the previous year, the population has grown by 0. In Gunnedah, Christianity was the largest broad group religious group reported overall (62. The Namoi River flows west then north-west Gunnedah's 2026 population is now estimated at 10,227. These population values and projections come from Australia SA2 population series over 10k (ABS) and World Population Review Internal Projections . Gunnedah has grown by 66 in the last year, which represents a 0. Overview Total Area:4,987 sqkm Population:13,125 Major Town:Gunnedah May 1, 2023 · Gunnedah’s koala population is headed for extinction. Population growth in Regional NSW was 0. 7%) (excludes Not stated). In Gunnedah, Christianity was the largest broad group religious group reported overall (60. 9ei0f, mdp3, gon, iwohozro, 41, incuj5t, wct4, lh6, 7scu0g6, 8ska3,