The departement number of your destination is made out of the first two digits of the zip code. For exemple, Nice, zip code 06000 and Aspremont, zip code 06790 are in the 06 departement, Alpes Maritimes. (South East corner)
Here a map showing these numbers. The Paris area with its tiny departements is separated. (Paris =75)
Departement #, Name, Head city
01 | Ain | Bourg en Bresse | 44 | Loire Atlantique | Nantes |
02 | Aisne | Laon | 45 | Loiret | Orléans |
03 | Allier | Moulins | 46 | Lot | Cahors |
04 | Basses Alpes | Digne | 47 | Lot & Garonne | Agen |
05 | Hautes Alpes | Gap | 48 | Lozere | Mende |
06 | Alpes Maritimes | Nice | 49 | Maine & Loire | Angers |
07 | Ardeche | Privas | 50 | Manche | St Lo |
08 | Ardennes | Charleville | 51 | Marne | Chalons/Marne |
09 | Ariège | Foix | 52 | Haute Marne | Chaumont |
10 | Aube | Troyes | 53 | Mayenne | Laval |
11 | Aude | Carcassone | 54 | Meurthe & Moselle | Nancy |
12 | Aveyron | Rodez | 55 | Meuse | Bar le Duc |
13 | Bouches du Rhone | Marseille | 56 | Morbihan | Vannes |
14 | Calvados | Caen | 57 | Moselle | Metz |
15 | Cantal | Aurillac | 58 | Nievre | Nevers |
16 | Charente | Angoulème | 59 | Nord | Lille |
17 | Charente Maritime | La Rochelle | 60 | Oise | Beauvais |
18 | Correze | Tulle | 61 | Orne | Alençon |
19 | Creuse | Guéret | 62 | Pas de Calais | Calais |
20 | Corse | Ajaccio | 63 | Puy de Dome | Clermont Fd |
21 | Cote d'Or | Dijon | 64 | Pyrénées Atlantiques | Pau |
22 | Cotes du Nord | St Brieuc | 65 | Hautes Pyrénées | Tarbes |
23 | Creuse | Guéret | 66 | Pyrénées Orientales | Perpignan |
24 | Dordogne | Périgueux | 67 | Bas Rhin | Strasbourg |
25 | Doubs | Besançon | 68 | Haut Rhin | Colmar |
26 | Drome | Valence | 69 | Rhone | Lyon |
27 | Eure | Evreux | 70 | Haute Saône | Vesoul |
28 | Eure et Loire | Chartres | 71 | Saône et Loire | Macon |
29 | Finistère | Brest | 72 | Sarthe | Le Mans |
30 | Gard | Nimes | 73 | Savoie | Chambery |
31 | Haute Garonne | Toulouse | 74 | Haute Savoie | Annecy |
32 | Gers | Auch | 75 | Paris | Paris |
33 | Gironde | Bordeaux | 76 | Seine Maritime | Rouen |
34 | Herault | Montpellier | 77 | Seine & Marne | Melun |
35 | Ill et Vilaine | Rennes | 78 | Yvelines | Versailles |
36 | Indre | Chateauroux | 79 | Deux Sevres | Niort |
37 | Indre et loire | Tours | 80 | Somme | Amiens |
38 | Isère | Grenoble | 81 | Tarn | Albi |
39 | Jura | Lons le saulnier | 82 | Tarn et Garonne | Montauban |
40 | Landes | Mt de Marsan | 83 | Var | Toulon |
41 | Loir et Cher | Blois | 84 | Vaucluse | Avignon |
42 | Loire | St Etienne | 85 | Vendée | La Roche /Yon |
43 | Haute Loire | Le Puy | 86 | Vienne | Poitiers |
87 | Haute Vienne | Limoges | 89 | Yonne | Auxerre |
88 | Vosges | Epinal | 90 | Territoire de Belfort | Belfort |
Departement 91 to 95 are just around Paris.