Cernache is a civil parish in the municipality of Coimbra, Portugal. The population in 2021 was 3,957, in an area of 19.17 km.

Population of the civil parish of Cernache (1864–2021) Year Pop. ±% 1864 2,309 —     1878 2,686 +16.3% 1890 2,828 +5.3% 1900 2,866 +1.3% 1911 2,927 +2.1% 1920 2,811 −4.0% 1930 2,850 +1.4% 1940 3,010 +5.6% 1950 2,964 −1.5% 1960 3,030 +2.2% 1970 3,101 +2.3% 1981 3,496 +12.7% 1991 3,650 +4.4% 2001 3,871 +6.1% 2011 4,048 +4.6% 2021 3,957 −2.2%