diff --git a/js/id/geo.js b/js/id/geo.js
index e44b182a6..08df659b0 100644
--- a/js/id/geo.js
+++ b/js/id/geo.js
@@ -74,30 +74,6 @@ iD.geo.polygonIntersectsPolygon = function(outer, inner) {
     });
 };
 
-// May have issues with self interesecting polygons
-iD.geo.polygonCentroid = function(polygon) {
-    var x = 0,
-        y = 0,
-        area = iD.geo.area(polygon);
-    for (var i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {
-        var xi = polygon[i][0], yi = polygon[i][1];
-        var xj = polygon[j][0], yj = polygon[j][1];
-        x += (xi + xj) * (xj * yi - xi * yj);
-        y += (yi + yj) * (xj * yi - xi * yj);
-    }
-    return [x / 6 / area, y / 6 / area];
-};
-
-iD.geo.area = function(polygon) {
-    var area = 0;
-    for (var i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {
-        var xi = polygon[i][0], yi = polygon[i][1];
-        var xj = polygon[j][0], yj = polygon[j][1];
-        area += xj * yi - xi * yj;
-    }
-    return area/2;
-};
-
 iD.geo.pathLength = function(path) {
     var length = 0,
         dx, dy;
diff --git a/js/id/svg/labels.js b/js/id/svg/labels.js
index d50ecfc97..0db2c59e2 100644
--- a/js/id/svg/labels.js
+++ b/js/id/svg/labels.js
@@ -284,7 +284,7 @@ iD.svg.Labels = function(projection) {
         function getAreaLabel(entity, width, height) {
             var nodes = _.pluck(entity.nodes, 'loc')
                 .map(iD.svg.RoundProjection(projection)),
-                centroid = iD.geo.polygonCentroid(nodes),
+                centroid = d3.geom.polygon(nodes).centroid(),
                 extent = entity.extent(graph),
                 entitywidth = projection(extent[1])[0] - projection(extent[0])[0];
 
diff --git a/test/spec/util.js b/test/spec/util.js
index 24f7e6ca7..9d5cf082b 100644
--- a/test/spec/util.js
+++ b/test/spec/util.js
@@ -113,20 +113,6 @@ describe('iD.Util', function() {
             });
         });
 
-        describe("#area", function() {
-            it('calculates the area of a trapezoid', function() {
-                var polygon = [[0, 0], [3, 0], [2, 2], [1, 2]];
-                expect(iD.geo.area(polygon)).to.eql(4);
-            });
-        });
-
-        describe('#polygonCentroid', function() {
-            it('calculates the centroid of a square', function() {
-                var square = [[0, 0], [0, 2], [2, 2], [2, 0]];
-                expect(iD.geo.polygonCentroid(square)).to.eql([1, 1]);
-            });
-        });
-
         describe('#pathLength', function() {
             it('calculates a simple path length', function() {
                 var path = [[0, 0], [0, 1], [3, 5]];