Index map for the sheets of National Maps of Switzerland 1:25,000 (print) and the tiles the Swiss Map Raster 25 (digital) by the Swiss Federal Office of Topography (Swisstopo). With digital only tiles in light grey, a few notable locations as red dots.
The sheets (tiles) are on a 19x21 grid. Standard sheets cover an area of 12 km x 17.5 km (210 km²).
There are few differences between the two editions:

some printed sheets include adjacent areas. These are generally available in additional (partial) tiles.
numbering differs between print and digital:
1199 bis: Piz Lad → 2000
1219 bis: Glurns/Glorenza → 2220
1239 bis: Müstair → 2240
additional digital tiles (in light grey), only parts of the area:
1282 Thonon-les-Bains Süd (in print included in 1262 Thonon-les-Bains)
1283 Monthey West (in print included in 1284 Monthey)
1295 Grono Ost (in print included in 1294 Grono)
1303
1310	Simplon Ost (in print included in 1309 Simplon)
1318 Lago di Poschiavo Süd (in print included in 1298 Lago di Poschiavo)
1320 Chancy Süd (in print included in 1300 Chancy)
1354 Como Nord (in print included in 1374 Como)
1368 Zermatt Süd (in print included in 1348 Zermatt)
2180 Samnaun Ost (in print included in 1179 Samnaun. Number of field would be 1179bis in print)
2260 Müstair Süd (in print included in 1239 bis Müstair. Number of field would be 1259bis in print)Available digitally, but not recently in print:

1035: Friedrichshafen
1056: LindauThe red dots (from samples) are:

Bern: initial point zero of the Swiss grid
Zimmerwald
Chrischona
La Givrine
Monte Generoso
Pfänder
Zürich Landesmuseum Kontrollpunkt: a geocoded former boundary stone near Zurich railway station to compare user's GPS.
own svg based on File:Topo 25 sheets orig.jpg, Category:Swisstopo 1:25'000 map sheets
Federal Office of Topography