Flags with blue and white
71 of the 196 national flags here contain blue and white; 8 use only those colours.
Only blue and white (8)
With blue and white and other colours too (63)
What the list shows
71 of the 196 national flags here contain blue and white; 8 use only those colours. That is 36% of the flags in this list. The list is the 196 states the United Nations recognises as members or observers, plus Kosovo; territories are left out because most of them share their parent's flag.
By continent: Europe 17 of 46, Africa 15 of 54, North America 13 of 22, Asia 12 of 47, Oceania 10 of 14, South America 4 of 13. Europe has the most (17), and Oceania has the highest share (71% of its flags).
Colours and layout
Other colours that turn up alongside them: red on 49, yellow on 19, green on 17, black on 10. For comparison, red is on 77% of all 196 flags and white on 69%.
Layout: 24 of these 71 are built from stripes (23 horizontal, 1 vertical) and 47 are not. Across all 196 flags the stripe share is 42%.
Exactly these colours
Exactly these colours and no others: 8 — El Salvador, Finland, Greece, Honduras, Israel, Micronesia, Nicaragua, Somalia. The other 63 add at least one more colour, often in a small emblem or a canton.
Capitals of the first few, to place them: Antigua and Barbuda (St. John's), Argentina (Buenos Aires), Australia (Canberra), Azerbaijan (Baku), Belize (Belmopan), and so on down the list. The shortest names here are Cuba, Fiji and Laos.
How the labels were made: colours are measured from the flag image (a colour counts if it covers at least 0.6% of the flag, edges excluded, so a small emblem can add a colour), and symbols were labelled by hand. A flag with a detailed coat of arms can legitimately appear under several symbols. If a flag looks mislabelled, the corrections link on the about page is the way to say so.
How the flags are labelled. Images are from the open-source flag-icons set (MIT). Colours are measured from each image; symbols are labelled by hand. Names follow the source lists and do not imply any judgment on the status of any territory. Sources and limits.