ClasséChâteau · protected 1972Château des Lions (ancien)Part of the building is protectedPhoto: ℍenry Salomé · CC BY-SA 3.0 · Wikimedia Commons
Château des Lions (ancien) · Photo: ℍenry Salomé · CC BY-SA 3.03historic monuments
History of Le Port-Marly · Monuments historiques
3 historic monuments, 3 classé
Since 1937, Le Port-Marly has had a listed monument. The oldest monuments in Le Port-Marly date from the 17th century. We have photos of 3 of Le Port-Marly’s monuments.
Monuments historiques
3
Classé
3
the highest protection
Inscrit
0
the second level
Oldest part
17th c.
of any listed monument
Homes before 1919
2.4%
median compared town 7.4%
In pictures
Monuments of Le Port-Marly in pictures
Nearly every classé monument, photographed. Tap a photo to step through them full screen.
Photos from Wikimedia Commons, copied to our own server, each credited to its photographer with its license; names open the monument’s page.
Map
Where Le Port-Marly’s monuments stand
Every monument with a point on the ministry’s list; the larger, darker dots are classé.
Classé
Tap a dot to open the monument’s page: its record, photo and the monuments around it.
3 monuments by protection
3 Classé
Classé is the higher protection: any work on the building needs the State’s permission. Work on an inscrit building must be declared to the State in advance. Around both, building work in sight of the monument (usually within 500 m) needs the agreement of the architecte des Bâtiments de France.
Points as the ministry gives them: a monument spread over several plots has one point.
Classé
3 classé monuments in Le Port-Marly
Classé is France’s highest protection for a building, held by about a third of the monuments on the list. 1 of the 3 is protected in part only (a façade, a roof, a room). Each card opens the monument’s page.
Classé
ClasséAge of homes
2.4% of homes in Le Port-Marly were built before 1919
Main homes by when they were finished, beside the median compared French town (the tick).
2.4%
Before 1919
3.3%
1919–45
28%
1946–70
25%
1971–90
20%
1991–2005
22%
2006 on
Le Port-MarlyMedian compared French town
2.4% of its main homes were built before 1919; the median compared French town has 7.4%. More of them were finished between 1946 and 1970 than in any other period (28%).
INSEE, census 2023: main homes (résidences principales) only; second homes and empty homes aren’t dated.
Neighbors
Historic monuments in the towns around Le Port-Marly
| Town | Residents | Monuments | Classé | Protected area |
|---|---|---|---|---|
| Le Port-Marly | 5,559 | 3 | 3 | — |
| Marly-le-Roi | 16,756 | 8 | 6 | Yes |
| Le Pecq | 16,059 | 4 | 0 | Yes |
| Louveciennes | 7,990 | 11 | 5 | Yes |
| Croissy-sur-Seine | 11,013 | 4 | 0 | Yes |
| Mareil-Marly | 4,141 | 1 | 1 | — |
| Le Vésinet | 15,554 | 5 | 2 | Yes |
In brief
Le Port-Marly in brief
The official list counts 3 historic monuments in Le Port-Marly, 3 of them classé. Château de Monte-Cristo is one of the Maisons des Illustres, the homes of people who left their mark on France. Its homes are mostly newer: 2.4% were built before 1919, against 7.4% in the median compared French town. The oldest, Château des Lions (ancien), dates from the 17th century. Beyond that, it has 3 historic monuments, about typical for a town its size (the middle one has 2); and the list grew between 1937 and 2016.
How to read these numbers
What this data can and can’t tell you
- Monuments historiques. France protects buildings at two levels. Classé, the higher (about a third of the list), means any work needs the State’s permission; inscrit means work must be declared to the State in advance. The Culture ministry’s Mérimée base lists every protected building, and this page counts them.
- Partly protected. Many entries protect part of a building only (its façades and roofs, a staircase, a painted room). Each counts as one monument, like a fully protected one.
- Where a monument is counted. In the commune named on its protection, moved to today’s commune where communes have since merged. A monument listed for several communes counts in each.
- Sites patrimoniaux remarquables. Since 2016 France’s protected historic areas (the former secteurs sauvegardés, ZPPAUP and AVAP) share one name. Inside one, building work follows the area’s plan and needs the agreement of the architecte des Bâtiments de France.
- What isn’t here. Protected objects (furniture, organs, paintings), old buildings with no protection, UNESCO World Heritage listings and labels such as “Plus Beaux Villages de France” aren’t on this list, so this page doesn’t count them.
- No History Grade yet. Everything on this page is described, not graded: France’s History Grade isn’t built yet.
Questions about the history of Le Port-Marly
How many historic monuments are there in Le Port-Marly?
The Culture ministry lists 3 historic monuments in Le Port-Marly: 3 classé and 0 inscrit.
Which monuments in Le Port-Marly are classé?
3, among them Château des Lions (ancien), Église Saint-Louis and Château de Monte-Cristo.
How old are the homes in Le Port-Marly?
2.4% of its main homes were built before 1919 (median compared French town: 7.4%).
France has no History Grade yet: this page describes, it doesn’t grade.
Sources: Ministère de la Culture, Mérimée base on POP (immeubles protégés au titre des monuments historiques), October 2026 · Ministère de la Culture, sites patrimoniaux remarquables, October 2026 · INSEE, census 2023 (main homes by build period) · Wikimedia Commons and Wikidata (photos of the monuments, each with its own credit and license) · IGN Admin Express (boundaries) · Medians and percentiles: TownRatings, over compared French towns, updated November 9, 2026. Under the Licence Ouverte / Open Licence 2.0 (Etalab).
Contains public sector information under the Licence Ouverte / Open Licence 2.0 (Etalab): INSEE, DGFiP, the Interior Ministry’s statistics service (SSMSI), the Ministry of Education (DEPP), the Health Ministry’s statistics service (DREES) and the Housing Ministry (Carte des loyers). Commune boundaries: IGN Admin Express.