A team of astronomers has reduced the uncertainty in the local value of the Hubble constant (H₀) from 3.3% to 2.4% using observations from the Hubble Space Telescope (HST). This improvement was achieved by obtaining new near-infrared observations of Cepheid variables in 11 host galaxies of recent type Ia supernovae (SNe Ia), doubling the sample of reliable SNe Ia with Cepheid-calibrated distances to a total of 19. These observations, combined with data from 300 SNe Ia at z < 0.15, helped refine the magnitude-redshift relation. All 19 host galaxies and the megamaser system NGC 4258 were observed with WFC3 in the optical and near-infrared, eliminating cross-instrument zeropoint errors in the relative distance estimates from Cepheids. Other improvements include a 33% reduction in systematic uncertainty in the maser distance to NGC 4258, a larger Cepheid sample in the Large Magellanic Cloud (LMC), a more robust distance to the LMC based on late-type detached eclipsing binaries (DEBs), HST observations of Cepheids in M31, and new HST-based trigonometric parallaxes for Milky Way (MW) Cepheids. The team considered four geometric distance calibrations of Cepheids: (i) megamasers in NGC 4258, (ii) 8 DEBs in the LMC, (iii) 15 MW Cepheids with parallaxes measured with HST/FGS, HST/WFC3 spatial scanning and/or Hipparcos, and (iv) 2 DEBs in M31. The Hubble constant from each was 72.25 ± 2.51, 72.04 ± 2.67, 76.18 ± 2.37, and 74.50 ± 3.27 km s⁻¹ Mpc⁻¹, respectively. The best estimate of H₀ = 73.24 ± 1.74 km s⁻¹ Mpc⁻¹ combines the anchors NGC 4258, MW, and LMC, yielding a 2.4% determination. This value is 3.4σ higher than the prediction of 66.93 ± 0.62 km s⁻¹ Mpc⁻¹ from ΛCDM with 3 neutrino flavors having a mass of 0.06 eV and the new Planck data, but the discrepancy reduces to 2.1σ relative to the prediction of 69.3 ± 0.7 km s⁻¹ Mpc⁻¹A team of astronomers has reduced the uncertainty in the local value of the Hubble constant (H₀) from 3.3% to 2.4% using observations from the Hubble Space Telescope (HST). This improvement was achieved by obtaining new near-infrared observations of Cepheid variables in 11 host galaxies of recent type Ia supernovae (SNe Ia), doubling the sample of reliable SNe Ia with Cepheid-calibrated distances to a total of 19. These observations, combined with data from 300 SNe Ia at z < 0.15, helped refine the magnitude-redshift relation. All 19 host galaxies and the megamaser system NGC 4258 were observed with WFC3 in the optical and near-infrared, eliminating cross-instrument zeropoint errors in the relative distance estimates from Cepheids. Other improvements include a 33% reduction in systematic uncertainty in the maser distance to NGC 4258, a larger Cepheid sample in the Large Magellanic Cloud (LMC), a more robust distance to the LMC based on late-type detached eclipsing binaries (DEBs), HST observations of Cepheids in M31, and new HST-based trigonometric parallaxes for Milky Way (MW) Cepheids. The team considered four geometric distance calibrations of Cepheids: (i) megamasers in NGC 4258, (ii) 8 DEBs in the LMC, (iii) 15 MW Cepheids with parallaxes measured with HST/FGS, HST/WFC3 spatial scanning and/or Hipparcos, and (iv) 2 DEBs in M31. The Hubble constant from each was 72.25 ± 2.51, 72.04 ± 2.67, 76.18 ± 2.37, and 74.50 ± 3.27 km s⁻¹ Mpc⁻¹, respectively. The best estimate of H₀ = 73.24 ± 1.74 km s⁻¹ Mpc⁻¹ combines the anchors NGC 4258, MW, and LMC, yielding a 2.4% determination. This value is 3.4σ higher than the prediction of 66.93 ± 0.62 km s⁻¹ Mpc⁻¹ from ΛCDM with 3 neutrino flavors having a mass of 0.06 eV and the new Planck data, but the discrepancy reduces to 2.1σ relative to the prediction of 69.3 ± 0.7 km s⁻¹ Mpc⁻¹