diff --git a/API.md b/API.md
index 4e4f994fe..de5a9a21c 100644
--- a/API.md
+++ b/API.md
@@ -45,8 +45,8 @@ of iD (e.g. `https://ideditor-release.netlify.app`), the following parameters ar
   _Available values:_ `streetside` (Microsoft Bing), `mapillary`, `mapillary-signs`, `mapillary-map-features`, `openstreetcam`
 * __`photo_dates`__ - The range of capture dates by which to filter street-level photos. Dates are given in YYYY-MM-DD format and separated by `_`. One-sided ranges are supported.<br/>
   _Example:_ `photo_dates=2019-01-01_2020-12-31`, `photo_dates=2019-01-01_`, `photo_dates=_2020-12-31`<br/>
-* __`photo_username`__ - The Mapillary or OpenStreetCam username by which to filter street-level photos.<br/>
-  _Example:_ `photo_user=quincylvania`<br/>
+* __`photo_username`__ - The Mapillary or OpenStreetCam username by which to filter street-level photos. Multiple comma-separated usernames are supported.<br/>
+  _Example:_ `photo_user=quincylvania`, `photo_user=quincylvania,chrisbeddow`<br/>
 * __`photo`__ - The service and ID of the street-level photo to show.<br/>
   _Example:_ `photo=streetside/718514589`<br/>
   _Available prefixes:_ `streetside/`, `mapillary/`, `openstreetcam/`
diff --git a/modules/renderer/photos.js b/modules/renderer/photos.js
index 865797e5e..d8267a048 100644
--- a/modules/renderer/photos.js
+++ b/modules/renderer/photos.js
@@ -13,7 +13,7 @@ export function rendererPhotos(context) {
     var _dateFilters = ['fromDate', 'toDate'];
     var _fromDate;
     var _toDate;
-    var _username;
+    var _usernames;
 
     function photos() {}
 
@@ -81,10 +81,21 @@ export function rendererPhotos(context) {
     };
 
     photos.setUsernameFilter = function(val, updateUrl) {
-        _username = val;
+        if (val && typeof val === 'string') val = val.replace(/;/g, ',').split(',');
+        if (val) {
+            val = val.map(d => d.trim()).filter(Boolean);
+            if (!val.length) {
+                val = null;
+            }
+        }
+        _usernames = val;
         dispatch.call('change', this);
         if (updateUrl) {
-            setUrlFilterValue('photo_username', val);
+            var hashString;
+            if (_usernames) {
+                hashString = _usernames.join(',');
+            }
+            setUrlFilterValue('photo_username', hashString);
         }
     };
 
@@ -117,7 +128,7 @@ export function rendererPhotos(context) {
     };
 
     photos.shouldFilterByUsername = function() {
-        return showsLayer('mapillary') || showsLayer('openstreetcam');
+        return showsLayer('mapillary') || showsLayer('openstreetcam') || showsLayer('streetside');
     };
 
     photos.showsPhotoType = function(val) {
@@ -153,8 +164,8 @@ export function rendererPhotos(context) {
         return photos;
     };
 
-    photos.username = function() {
-        return _username;
+    photos.usernames = function() {
+        return _usernames;
     };
 
     photos.init = function() {
diff --git a/modules/services/mapillary.js b/modules/services/mapillary.js
index ee44d441f..60e969f5a 100644
--- a/modules/services/mapillary.js
+++ b/modules/services/mapillary.js
@@ -492,12 +492,12 @@ export default {
         var showsFlat = context.photos().showsFlat();
         var fromDate = context.photos().fromDate();
         var toDate = context.photos().toDate();
-        var username = context.photos().username();
+        var usernames = context.photos().usernames();
         var filter = ['all'];
 
         if (!showsPano) filter.push(['==', 'pano', false]);
         if (!showsFlat && showsPano) filter.push(['==', 'pano', true]);
-        if (username) filter.push(['==', 'username', username]);
+        if (usernames && usernames.length) filter.push(['==', 'username', usernames[0]]);
         if (fromDate) {
             var fromTimestamp = new Date(fromDate).getTime();
             filter.push(['>=', 'capturedAt', fromTimestamp]);
diff --git a/modules/svg/mapillary_images.js b/modules/svg/mapillary_images.js
index 88b148e20..515bdda12 100644
--- a/modules/svg/mapillary_images.js
+++ b/modules/svg/mapillary_images.js
@@ -116,7 +116,7 @@ export function svgMapillaryImages(projection, context, dispatch) {
         var showsFlat = context.photos().showsFlat();
         var fromDate = context.photos().fromDate();
         var toDate = context.photos().toDate();
-        var username = context.photos().username();
+        var usernames = context.photos().usernames();
 
         if (!showsPano || !showsFlat) {
             images = images.filter(function(image) {
@@ -136,9 +136,9 @@ export function svgMapillaryImages(projection, context, dispatch) {
                 return new Date(image.captured_at).getTime() <= toTimestamp;
             });
         }
-        if (username) {
+        if (usernames) {
             images = images.filter(function(image) {
-                return image.captured_by === username;
+                return usernames.indexOf(image.captured_by) !== -1;
             });
         }
         return images;
@@ -149,7 +149,7 @@ export function svgMapillaryImages(projection, context, dispatch) {
         var showsFlat = context.photos().showsFlat();
         var fromDate = context.photos().fromDate();
         var toDate = context.photos().toDate();
-        var username = context.photos().username();
+        var usernames = context.photos().usernames();
 
         if (!showsPano || !showsFlat) {
             sequences = sequences.filter(function(sequence) {
@@ -184,9 +184,9 @@ export function svgMapillaryImages(projection, context, dispatch) {
                 return new Date(sequence.properties.captured_at).getTime() <= toTimestamp;
             });
         }
-        if (username) {
+        if (usernames) {
             sequences = sequences.filter(function(sequence) {
-                return sequence.properties.username === username;
+                return usernames.indexOf(sequence.properties.username) !== -1;
             });
         }
 
diff --git a/modules/svg/openstreetcam_images.js b/modules/svg/openstreetcam_images.js
index aac65acdd..786ac4a79 100644
--- a/modules/svg/openstreetcam_images.js
+++ b/modules/svg/openstreetcam_images.js
@@ -110,7 +110,7 @@ export function svgOpenstreetcamImages(projection, context, dispatch) {
     function filterImages(images) {
         var fromDate = context.photos().fromDate();
         var toDate = context.photos().toDate();
-        var username = context.photos().username();
+        var usernames = context.photos().usernames();
 
         if (fromDate) {
             var fromTimestamp = new Date(fromDate).getTime();
@@ -124,9 +124,9 @@ export function svgOpenstreetcamImages(projection, context, dispatch) {
                 return new Date(item.captured_at).getTime() <= toTimestamp;
             });
         }
-        if (username) {
+        if (usernames) {
             images = images.filter(function(item) {
-                return item.captured_by === username;
+                return usernames.indexOf(item.captured_by) !== -1;
             });
         }
 
@@ -136,7 +136,7 @@ export function svgOpenstreetcamImages(projection, context, dispatch) {
     function filterSequences(sequences) {
         var fromDate = context.photos().fromDate();
         var toDate = context.photos().toDate();
-        var username = context.photos().username();
+        var usernames = context.photos().usernames();
 
         if (fromDate) {
             var fromTimestamp = new Date(fromDate).getTime();
@@ -150,9 +150,9 @@ export function svgOpenstreetcamImages(projection, context, dispatch) {
                 return new Date(image.properties.captured_at).getTime() <= toTimestamp;
             });
         }
-        if (username) {
+        if (usernames) {
             sequences = sequences.filter(function(image) {
-                return image.properties.captured_by === username;
+                return usernames.indexOf(image.properties.captured_by) !== -1;
             });
         }
 
@@ -177,7 +177,7 @@ export function svgOpenstreetcamImages(projection, context, dispatch) {
             sequences = filterSequences(sequences);
             images = filterImages(images);
         }
-        
+
         var traces = layer.selectAll('.sequences').selectAll('.sequence')
             .data(sequences, function(d) { return d.properties.key; });
 
diff --git a/modules/svg/streetside.js b/modules/svg/streetside.js
index e591824b7..ab1bc4a15 100644
--- a/modules/svg/streetside.js
+++ b/modules/svg/streetside.js
@@ -162,7 +162,7 @@ export function svgStreetside(projection, context, dispatch) {
     function filterBubbles(bubbles) {
         var fromDate = context.photos().fromDate();
         var toDate = context.photos().toDate();
-        var username = context.photos().username();
+        var usernames = context.photos().usernames();
 
         if (fromDate) {
             var fromTimestamp = new Date(fromDate).getTime();
@@ -176,9 +176,9 @@ export function svgStreetside(projection, context, dispatch) {
                 return new Date(bubble.captured_at).getTime() <= toTimestamp;
             });
         }
-        if (username) {
+        if (usernames) {
             bubbles = bubbles.filter(function(bubble) {
-                return bubble.captured_by === username;
+                return usernames.indexOf(bubble.captured_by) !== -1;
             });
         }
 
@@ -188,7 +188,7 @@ export function svgStreetside(projection, context, dispatch) {
     function filterSequences(sequences) {
         var fromDate = context.photos().fromDate();
         var toDate = context.photos().toDate();
-        var username = context.photos().username();
+        var usernames = context.photos().usernames();
 
         if (fromDate) {
             var fromTimestamp = new Date(fromDate).getTime();
@@ -202,9 +202,9 @@ export function svgStreetside(projection, context, dispatch) {
                 return new Date(sequences.properties.captured_at).getTime() <= toTimestamp;
             });
         }
-        if (username) {
+        if (usernames) {
             sequences = sequences.filter(function(sequences) {
-                return sequences.properties.captured_by === username;
+                return usernames.indexOf(sequences.properties.captured_by) !== -1;
             });
         }
 
diff --git a/modules/ui/sections/photo_overlays.js b/modules/ui/sections/photo_overlays.js
index 9ea1a8739..7d661c5b1 100644
--- a/modules/ui/sections/photo_overlays.js
+++ b/modules/ui/sections/photo_overlays.js
@@ -237,7 +237,7 @@ export function uiSectionPhotoOverlays(context) {
 
     function drawUsernameFilter(selection) {
         function filterEnabled() {
-            return context.photos().username();
+            return context.photos().usernames();
         }
         var ul = selection
             .selectAll('.layer-list-username-filter')
@@ -280,15 +280,22 @@ export function uiSectionPhotoOverlays(context) {
             .attr('type', 'text')
             .attr('class', 'list-item-input')
             .call(utilNoAuto)
-            .property('value', context.photos().username())
+            .property('value', usernameValue)
             .on('change', function() {
                 var value = d3_select(this).property('value');
                 context.photos().setUsernameFilter(value, true);
+                d3_select(this).property('value', usernameValue);
             });
 
         li
             .merge(liEnter)
             .classed('active', filterEnabled);
+
+        function usernameValue() {
+            var usernames = context.photos().usernames();
+            if (usernames) return usernames.join('; ');
+            return usernames;
+        }
     }
 
     function toggleLayer(which) {