Demography
At the 2001 census, Porthmadog had a population of 4,187, of which 18.2 percent were below the age of 16, whilst 23.6 percent were over 65 years of age. 69.5 percent of households were owner occupied and 24.6 percent were in rented accommodation. Holiday homes accounted for 12.5 percent of dwellings.
| Year | 1801 | 1811 | 1821 | 1831 | 1841 | 1851 | 1861 | 1871 | 1881 |
| Population | 525 | 889 | 885 | 1,075 | 1,888 | 2,347 | 3,138 | 4,367 | 5,506 |
| Year | 1891 | 1901 | 1911 | 1921 | 1931 | 1939 | 1951 | 1961 | 2001 |
| Population | 5,224 | 4,883 | 4,445 | 4,184 | 3,986 | 4,618 | 4,061 | 3,960 | 4,187 |
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