For 30,000+, in different cities, we can add:
Hillsborough (Sheffield - Sheffield Wednesday) - 39,859
Riverside Stadium (Middlesbrough - Middlesbrough) - 35,100
Pride Park (Derby - Derby County) - 33,597
Ricoh Arena (Coventry - Coventry City) - 32,500
Walkers Stadium (Leicester - Leicester City) - 32,500
St. Mary's (Southampton - Southampton) - 32,251
Ewood Park (Blackburn - Blackburn Rovers) - 31,367
City Ground (Nottingham - Nottingham Forest) - 30,602
Portman Road (Ipswich - Ipswich Town) - 30,300
Portsmouth are redeveloping Fratton Park next summer to a 35,000 capacity stadium. Hillsborough, with a little Lottery money, could join the ranks of the 40,000+ with absolutely no trouble at all.