| Commune | Code | Observation(s) | % des observations totales |
|---|---|---|---|
| Amilly | 28006 | 1 | 0.3 |
| Argenvilliers | 28010 | 1 | 0.3 |
| Aunay-sous-Crécy | 28014 | 1 | 0.3 |
| Authon-du-Perche | 28018 | 1 | 0.3 |
| Bailleau-l'Évêque | 28022 | 76 | 20 |
| Belhomert-Guéhouville | 28033 | 1 | 0.3 |
| Billancelles | 28040 | 7 | 1.8 |
| Bouglainval | 28052 | 7 | 1.8 |
| Briconville | 28060 | 1 | 0.3 |
| Bû | 28064 | 1 | 0.3 |
| Châteauneuf-en-Thymerais | 28089 | 2 | 0.5 |
| Chuisnes | 28099 | 4 | 1.1 |
| Cintray | 28100 | 1 | 0.3 |
| Coudray-au-Perche | 28111 | 2 | 0.5 |
| Courville-sur-Eure | 28116 | 1 | 0.3 |
| Crucey-Villages | 28120 | 3 | 0.8 |
| Dangers | 28128 | 1 | 0.3 |
| Fontaine-la-Guyon | 28154 | 26 | 6.8 |
| Fontaine-Simon | 28156 | 2 | 0.5 |
| Frazé | 28161 | 3 | 0.8 |
| La Ferté-Vidame | 28149 | 2 | 0.5 |
| Landelles | 28203 | 11 | 2.9 |
| La Puisaye | 28310 | 2 | 0.5 |
| Le Favril | 28148 | 3 | 0.8 |
| Le Mesnil-Thomas | 28248 | 1 | 0.3 |
| Le Thieulin | 28385 | 2 | 0.5 |
| Lèves | 28209 | 28 | 7.4 |
| Louvilliers-lès-Perche | 28217 | 1 | 0.3 |
| Luigny | 28219 | 3 | 0.8 |
| Maillebois | 28226 | 2 | 0.5 |
| Mainvilliers | 28229 | 78 | 20.5 |
| Manou | 28232 | 2 | 0.5 |
| Montigny-le-Chartif | 28261 | 2 | 0.5 |
| Montireau | 28264 | 1 | 0.3 |
| Nonvilliers-Grandhoux | 28282 | 1 | 0.3 |
| Pontgouin | 28302 | 2 | 0.5 |
| Rueil-la-Gadelière | 28322 | 2 | 0.5 |
| Saint-Ange-et-Torçay | 28323 | 23 | 6.1 |
| Saint-Arnoult-des-Bois | 28324 | 29 | 7.6 |
| Saint-Aubin-des-Bois | 28325 | 44 | 11.6 |
| Saint-Éliph | 28335 | 2 | 0.5 |
| Saint-Éman | 28336 | 1 | 0.3 |
| Saintigny | 28331 | 2 | 0.5 |
| Saint-Maurice-Saint-Germain | 28354 | 1 | 0.3 |
| Saint-Prest | 28358 | 5 | 1.3 |
| Saint-Sauveur-Marville | 28360 | 3 | 0.8 |
| Saint-Victor-de-Buthon | 28362 | 2 | 0.5 |
| Senonches | 28373 | 2 | 0.5 |
| Tréon | 28394 | 1 | 0.3 |