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NOAA/ESRL - April 2026 Atmospheric CO2 Content: 431.12 ppm; April 2025 429.64 ppm; April 2024 426.51 ppm
Whaddya know?!? ESRL is (apparently) partially staffed!! 
They also provide official monthly data for the prior month.
March 2026 Atmospheric CO2 Content: 430.15 ppm
March 2025 Atmospheric CO2 Content: 428.15 ppm
March 2024 Atmospheric CO2 Content: 425.38 ppm
This: https://gml.noaa.gov/ccgg/trends/
Leads to this: https://gml.noaa.gov/ccgg/trends/data.html
Leads to this: https://gml.noaa.gov/webdata/ccgg/trends/co2/co2_mm_mlo.txt