This study characterized the long-term changes in reported farm-level fowl typhoid occurrence in the Republic of Korea from 2000 to 2024. Farm-level notification records (n = 1495) were obtained from the national livestock disease database. Annual counts were analyzed on a log(count + 1) scale using segmented linear regression. The number of breakpoints was selected by Bayesian information criterion (BIC) comparison of candidate segmented models, and BIC favored a two-breakpoint model. Breakpoints were estimated at 2009.0 (95% CI, 2004.7-2013.3) and 2016.5 (95% CI, 2014.1-2019.0). Phase 1 (2000-2009) declined significantly (annual percent change [APC], -16.3%; 95% CI, -25.9 to -5.5), Phase 2 (2009-2016) showed no significant change (APC, 3.7%; 95% CI, -10.3 to 20.0), and Phase 3 (2016-2024) showed an accelerated decline (APC, -28.0%; 95% CI, -34.9 to -19.8). Province-specific post-2016 slopes were not associated with cumulative provincial HPAI events during 2014-2024 (Spearman´s ρ = -0.143, p = 0.736). The post-2016 acceleration temporally overlapped with the 2016-2017 H5N6 HPAI epidemic, but the study did not measure the contemporaneous interventions or denominators needed for causal attribution.