According to the Pub photos by county page, "Pubs Galore has has 49984 open pubs listed in the UK of which 45437 (90.9%) have been photographed by our users" which shows considerable progress since I last checked.

The top 15 currently looks like this:

Rank County Open Pubs With Photos %
1 Hertfordshire 768 768 100
2 Bristol (County) 696 696 100
3 Buckinghamshire 460 460 100
4 Isle Of Wight 165 165 100
5 Western Isles 32 32 100
6 London (Central) 2118 2116 99.9
7 Oxfordshire 667 666 99.9
8 Suffolk 645 644 99.8
9 Essex 1047 1044 99.7
10 Cumbria 769 766 99.6
11 Central 230 229 99.6
12 Surrey 680 677 99.6
13 Berkshire 587 583 99.3
14 West Sussex 535 530 99.1
15 Gloucestershire 598 592 99.0

So close on ten more counties! And then there is...

Rank County Open Pubs With Photos %
75 Tyrone 127 1 0.8