By the early 19th century, Glasgow was frequently referred to as the second city; and during much of the 20th century it had a population of over one million, larger than that of Birmingham until the 1951 census.
Pada awal abad ke-19, Glasgow sering disebut sebagai kota kedua; jumlah populasinya pada abad ke-20 lebih dari satu juta jiwa, lebih besar dari Birmingham hingga sensus 1951.