Boundary Park is close, but no cigar. 509 feet above sea level.
I assume there has been some land slippage since 2008 then.....
The 10 Highest Grounds in England and Wales (2008)
No. Stadium Name Home To Height (feet)
1 The Hawthorns West Bromwich Albion 552
2 Boundary Park Oldham Athletic 526
3 Vale Park Port Vale 520
4 The Crown Ground Accrington Stanley 516
5 Moss Rose Macclesfield Town 513
6 Spotland Rochdale 498
7 Molineux Wolverhampton Wanderers 483
8 St Andrews Birmingham City 432
9 The Britannia Stadium Stoke City 431
10 Adams Park Wycombe Wanderers 413