From d634d59bf2612aed01342e30a9d2d289d87e4567 Mon Sep 17 00:00:00 2001
From: Emily KL <4672118+emilykl@users.noreply.github.com>
Date: Wed, 29 Jul 2026 17:54:56 -0400
Subject: [PATCH 1/4] Remove auto-center behavior and hard-coded default zoom
 from px *_map() functions (now handled in plotly.js). Note: choropleth map
 auto-centering is not yet supported in plotly.js, but the default plotly.js
 zoom of 1 is still better than an arbitrary zoom of 8.

---
 plotly/express/_chart_types.py | 8 ++++----
 plotly/express/_core.py        | 8 +-------
 2 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/plotly/express/_chart_types.py b/plotly/express/_chart_types.py
index fd353d1a00..ad5f01d8b9 100644
--- a/plotly/express/_chart_types.py
+++ b/plotly/express/_chart_types.py
@@ -1258,7 +1258,7 @@ def scatter_map(
     color_continuous_midpoint=None,
     opacity=None,
     size_max=None,
-    zoom=8,
+    zoom=None,
     center=None,
     map_style=None,
     title=None,
@@ -1296,7 +1296,7 @@ def choropleth_map(
     range_color=None,
     color_continuous_midpoint=None,
     opacity=None,
-    zoom=8,
+    zoom=None,
     center=None,
     map_style=None,
     title=None,
@@ -1331,7 +1331,7 @@ def density_map(
     range_color=None,
     color_continuous_midpoint=None,
     opacity=None,
-    zoom=8,
+    zoom=None,
     center=None,
     map_style=None,
     radius=None,
@@ -1369,7 +1369,7 @@ def line_map(
     labels=None,
     color_discrete_sequence=None,
     color_discrete_map=None,
-    zoom=8,
+    zoom=None,
     center=None,
     map_style=None,
     title=None,
diff --git a/plotly/express/_core.py b/plotly/express/_core.py
index ddc98e67aa..9516402d84 100644
--- a/plotly/express/_core.py
+++ b/plotly/express/_core.py
@@ -793,14 +793,8 @@ def configure_3d_axes(args, fig, orders):
 
 
 def configure_map(args, fig, orders):
-    center = args["center"]
-    if not center and "lat" in args and "lon" in args:
-        center = dict(
-            lat=args["data_frame"][args["lat"]].mean(),
-            lon=args["data_frame"][args["lon"]].mean(),
-        )
     fig.update_maps(
-        center=center,
+        center=args["center"],
         zoom=args["zoom"],
         style=args["map_style"],
     )

From 9ac02ce37cfc71c1b1d6ba47d11d62505590068d Mon Sep 17 00:00:00 2001
From: Emily KL <4672118+emilykl@users.noreply.github.com>
Date: Wed, 29 Jul 2026 18:54:03 -0400
Subject: [PATCH 2/4] remove hard-coded zoom from px.scatter_map() Percy test,
 to visually test auto-fit behavior

---
 tests/percy/plotly-express.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/tests/percy/plotly-express.py b/tests/percy/plotly-express.py
index 9592b0b35d..a7bd980c32 100644
--- a/tests/percy/plotly-express.py
+++ b/tests/percy/plotly-express.py
@@ -386,7 +386,6 @@
     size="car_hours",
     color_continuous_scale=px.colors.cyclical.IceFire,
     size_max=15,
-    zoom=10,
 )
 fig.write_html(os.path.join(dir_name, "scatter_map.html"))
 

From 0e495c0fb269a8be38a6f6d9bc482684b10ad7bb Mon Sep 17 00:00:00 2001
From: Emily KL <4672118+emilykl@users.noreply.github.com>
Date: Wed, 29 Jul 2026 19:39:20 -0400
Subject: [PATCH 3/4] update changelog

---
 CHANGELOG.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 898bc1bf4c..32b89c0479 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 
+### Fixed
+- Improve `px.*_map()` auto-fitting behavior when `zoom` and `center` are not specified [[#5686](https://github.com/plotly/plotly.py/pull/5686)]
+
 
 ## [7.0.0rc0] - 2026-07-29
 

From 79d791ac982d334c3f75e0fb972a3f1e3783b173 Mon Sep 17 00:00:00 2001
From: Emily KL <4672118+emilykl@users.noreply.github.com>
Date: Thu, 30 Jul 2026 12:01:38 -0400
Subject: [PATCH 4/4] update zoom docstring

---
 plotly/express/_doc.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/plotly/express/_doc.py b/plotly/express/_doc.py
index 3df6a19159..42cb991df1 100644
--- a/plotly/express/_doc.py
+++ b/plotly/express/_doc.py
@@ -500,7 +500,12 @@
         "In `'overlay'` mode, strips are on drawn top of one another.",
         "In `'group'` mode, strips are placed beside each other.",
     ],
-    zoom=["int (default `8`)", "Between 0 and 20.", "Sets map zoom level."],
+    zoom=[
+        "int (default `None`)",
+        "Between 0 and 20.",
+        "Sets initial map zoom level. Higher values are more zoomed-in.",
+        "If not provided, the map will select its own zoom level.",
+    ],
     orientation=[
         "str, one of `'h'` for horizontal or `'v'` for vertical. ",
         "(default `'v'` if `x` and `y` are provided and both continuous or both categorical, ",