The most densely mapped locations in OSM

(FSVO "mapped")

If you render the world on zoom level 16, there are 67 million "meta tiles" (each covering an area of 8x8 tiles). The majority of them are in the sea, obviously, and unlikely to have any data. 20 million meta tiles are not in the sea; of these, roughly a quarter have at least one node.

As of 22nd May 2013, only 113 of these meta tiles have more than 10,000 nodes per square kilometre. (81 are in France, 17 in the US, 4 in Cameroon, 3 in Poland, 2 in Austria, and a few other countries have 1 each.) Here is the list of those top 113 areas.

ranknodes/sq kmcountryz16 metatileplace name
1.18930France métropolitaine33184,22536Madeleine, 8e Arrondissement, Paris, Île-de-France, 75008
2.18899France métropolitaine33176,22528Bois-Colombes, Nanterre, Hauts-de-Seine, Île-de-France, 92270
3.18887France métropolitaine33192,22536Quartier Saint-Vincent-de-Paul, 10e Arrondissement, Paris, Île-de-France, 75010
4.18471France métropolitaine32656,23608Lafon Féline, Le Bouscat, Bordeaux, Gironde, Aquitaine, 33110
5.18279Cameroun34856,32064Yaoundé III, Mfoundi, Centre, 11852
6.17923France métropolitaine32656,23616Centre ville, Bordeaux, Gironde, Aquitaine, 33000
7.17479France métropolitaine32800,22776Le Mans, Sarthe, Pays de la Loire, 72000
8.17387Cameroun34864,32056Yaoundé V, Mfoundi, Centre, 215
9.17178France métropolitaine33192,22544Sorbonne, 5e, Paris, Île-de-France, 75005
10.16605France métropolitaine32784,22360Sanvic, Paroisse Saint-Étienne des Hautes Terres, Seine-Maritime, Rouen, 76620
11.15791France métropolitaine33184,22544Invalides, 7e Arrondissement, Paris, Île-de-France, 75007
12.15376Cameroun34864,32064Yaoundé III, Mfoundi, Centre, 11852
13.15010France métropolitaine33216,22544Beauté Baltard, Nogent-sur-M., Nogent-sur-Marne, Val-de-Marne, Île-de-France, 94130
14.14869France métropolitaine33176,22552Issy-les-Moulineaux, Boulogne-Billancourt, Hauts-de-Seine, Île-de-France, 92130
15.14513France métropolitaine32960,22384Le Petit-Quevilly, Seine-Maritime, Haute-Normandie, 76140
16.14397France métropolitaine33216,22528Bondy, Bobigny, Seine-Saint-Denis, Île-de-France, 93140
17.14285France métropolitaine33208,22536Romainville, Bobigny, Seine-Saint-Denis, Île-de-France, 93230
18.14254France métropolitaine33344,22024Roubaix, Lille, Nord, Nord-Pas-de-Calais, 59100
19.14243France métropolitaine33184,22552Malakoff, Antony, Hauts-de-Seine, Île-de-France, 92240
20.14184United States of America16800,24336Chicago, Cook County, Illinois, 60618
21.14141France métropolitaine33208,22544Vincennes, Nogent-sur-Marne, Val-de-Marne, Île-de-France, 94300
22.13979France métropolitaine33744,24008Saint-Giniez, Marseille 8e Arrondissement, Marseille, Bouches-du-Rhône, Provence-Alpes-Côte-d'Azur, 13008
23.13918France métropolitaine33216,22560Adamville, Saint-Maur-des-F., Créteil, Val-de-Marne, Île-de-France, 94100
24.13899France métropolitaine33224,22528Clichy-sous-Bois, Le Raincy, Seine-Saint-Denis, Île-de-France, 93390
25.13724France métropolitaine33104,21952Calais, Pas-de-Calais, Nord-Pas-de-Calais, 62100
26.13724France métropolitaine33200,22544Quartier de Picpus, 12e Arrondissement, Paris, Île-de-France, 75012
27.13648France métropolitaine33168,22536Suresnes, Nanterre, Hauts-de-Seine, Île-de-France, 92150
28.13632France métropolitaine33216,22520Aulnay-sous-Bois, Le Raincy, Seine-Saint-Denis, Île-de-France, 93600
29.13622France métropolitaine33200,22536Amérique, 19e Arrondissement, Paris, Île-de-France, 75019
30.13451United States of America16792,24336Chicago, Cook County, Illinois, 60641
31.13420France métropolitaine33336,22024Mouvaux, Lille, Nord, Nord-Pas-de-Calais, 59420
32.13337France métropolitaine33744,24000Marseille 3e Arrondissement, Marseille, Bouches-du-Rhône, Provence-Alpes-Côte-d'Azur, 13003
33.13326United States of America16792,24344Chicago, Cook County, Illinois, 60641
34.13275Danmark34488,20568Søndervang, Kolding, Kolding Kommune, Region Syddanmark, 6000
35.13188France métropolitaine33752,24000La Fourragère, Marseille 12e Arrondissement, Marseille, Bouches-du-Rhône, Provence-Alpes-Côte-d'Azur, 13012
36.13178Cameroun34856,32056Mfoundi, Centre
37.13095France métropolitaine33184,22256Amiens, Somme, Picardie, 80000
38.13001France métropolitaine32664,22920Angers, Maine-et-Loire, Pays de la Loire, 49100
39.12986France métropolitaine33032,239284, Toulouse, Haute-Garonne, Midi-Pyrénées, 31500
40.12909United States of America16800,24344Chicago, Cook County, Illinois, 60647
41.12903France métropolitaine33504,22696Troyes, Aube, Champagne-Ardenne, 10000
42.12901United States of America16784,24336Chicago, Cook County, Illinois, 60634
43.12863France métropolitaine33328,22040Mons-en-Barœul, Lille, Nord, Nord-Pas-de-Calais, 59370
44.12744France métropolitaine32480,22984Pôle de proximité Nantes-Ouest, Nantes, Loire-Atlantique, Pays de la Loire, 44009
45.12676United States of America10488,22864Ballard, Seattle, King County, Washington, 98117
46.12495France métropolitaine33024,239282, Toulouse, Haute-Garonne, Midi-Pyrénées, 31000
47.12434United States of America16800,24376Chicago, Cook County, Illinois, 60629
48.12378France métropolitaine33192,22552Quartier de la Maison Blanche, 13e Arrondissement, Paris, Île-de-France, 75013
49.12365France métropolitaine33680,22960Dijon, Côte-d'Or, Franche-Comté, 21000
50.12238France métropolitaine33192,22560Villejuif, L'Haÿ-les-Roses, Val-de-Marne, Île-de-France, 94800
51.12231France métropolitaine32888,22944Cathédrale, Tours, Indre-et-Loire, Centre, 37010
52.12187United States of America16800,24328Chicago, Cook County, Illinois, 60659
53.11995France métropolitaine33216,22552Joinville-le-Pont, Nogent-sur-Marne, Val-de-Marne, Île-de-France, 94340
54.11834France métropolitaine33184,22560Bagneux, Antony, Hauts-de-Seine, Île-de-France, 92220
55.11823France métropolitaine33224,22544Bry-sur-M., Nogent-sur-Marne, Val-de-Marne, Île-de-France, 94360
56.11736France métropolitaine33336,22016Tourcoing, Lille, Nord, Nord-Pas-de-Calais, 52900
57.11733France métropolitaine32792,22360Saint-François, Le Havre, Seine-Maritime, Basse-Normandie, 76600
58.11708Österreich35744,22720Innere Stadt, Wien, Bezirk Wien, Wien, 1010
59.11683France métropolitaine33224,22560Chennevières-sur-M., Nogent-sur-Marne, Val-de-Marne, Île-de-France, 94430
60.11683France métropolitaine32680,23224Deux-Sèvres, Poitou-Charentes
61.11531France métropolitaine33160,22520Le Plateau, Sartrouville, Saint-Germain-en-Laye, Yvelines, Île-de-France, 78500
62.11396France métropolitaine33224,22552Champigny-sur-M., Nogent-sur-Marne, Val-de-Marne, Île-de-France, 94500
63.11379France métropolitaine33168,22520Bezons, Argenteuil, Val-d'Oise, Île-de-France, 95870
64.11309France métropolitaine33192,22592Savigny-sur-Orge, Palaiseau, Essonne, Île-de-France, 91600
65.11260United States of America16784,24344Chicago, Cook County, Illinois, 60639
66.11246France métropolitaine33224,22520Sevran, Le Raincy, Seine-Saint-Denis, Île-de-France, 93270
67.11211France métropolitaine34040,23936Le Riou, Cannes, Grasse, Alpes-Maritimes, Provence-Alpes-Côte-d'Azur, 06400
68.11205France métropolitaine33224,22536Gagny, Le Raincy, Seine-Saint-Denis, Île-de-France, 93220
69.11183France métropolitaine33200,21928Coudekerque-Branche, Dunkerque, Nord, Nord-Pas-de-Calais, 59210
70.11178France métropolitaine33208,22520Le Bourget, Bobigny, Seine-Saint-Denis, Île-de-France, 93350
71.11172United States of America16784,24328Chicago, Cook County, Illinois, 60646
72.11102United States of America16816,24384Chicago, Cook County, Illinois, 60619
73.11012Российская Федерация40144,17248Архангельск, Архангельская область, Северо-Западный федеральный округ, 163061
74.11008France métropolitaine33848,24048La Rode, Toulon, Var, Provence-Alpes-Côte-d'Azur, 83000
75.11007United States of America16792,24376Chicago, Cook County, Illinois, 60629
76.10955France métropolitaine33184,22512Enghien-les-Bains, Sarcelles, Val-d'Oise, Île-de-France, 95880
77.10948France métropolitaine34176,22616Krutenau, Strasbourg, Strasbourg - Ville, Bas-Rhin, Alsace, F-67073 STRASBOURG CEDEX
78.10898France métropolitaine33176,22544Auteuil, 16e Arrondissement, Paris, Île-de-France, 75016
79.10857France métropolitaine33320,22048Wazemmes, Lille, Nord, Nord-Pas-de-Calais, 59000
80.10712France métropolitaine32968,22376Quartier Gare / Jouvenet, Rouen, Seine-Maritime, Haute-Normandie, 76420
81.10693Polska35864,2190450-060
82.10671United States of America18744,25064Mount Vernon Square, Shaw, District of Columbia, 20001
83.10595France métropolitaine33176,22512Sannois, Argenteuil, Val-d'Oise, Île-de-France, 95110
84.10592France métropolitaine32480,23000La Coquetière, Pôle de proximité Loire et Sèvre, Rezé, Nantes, Loire-Atlantique, Pays de la Loire, 44400
85.10554France métropolitaine33328,23368Neuf Soleils, Clermont-Ferrand, Puy-de-Dôme, Auvergne, 63000
86.10541France métropolitaine33472,23920Centre, Montpellier, Hérault, Languedoc-Roussillon, 34000
87.10540France métropolitaine33160,22536Buzenval, Rueil-Malmaison, Nanterre, Hauts-de-Seine, Île-de-France, 92500
88.10524France métropolitaine32648,23608Capeyron, Mérignac, Bordeaux, Gironde, Aquitaine, 33700
89.10506Brasil25424,36536Mesorregião Central Espírito-Santense, Espírito Santo
90.10470France métropolitaine32504,23136La Roche-sur-Yon, Vendée, Pays de la Loire, 85000
91.10448France métropolitaine33176,22504Ermont, Pontoise, Val-d'Oise, Île-de-France, 95120
92.10424France métropolitaine33760,23992Plan-de-Cuques, Bouches-du-Rhône, Provence-Alpes-Côte-d'Azur, 13380
93.10406France métropolitaine32824,23160Poitiers, Vienne, Poitou-Charentes, 86000
94.10369United States of America16808,24392Chicago, Cook County, Illinois, 60643
95.10347France métropolitaine33032,22656Chartres, Eure-et-Loir, Centre, 28006
96.10345Polska35864,2191250-562
97.10337France métropolitaine33208,22528Bobigny, Seine-Saint-Denis, Île-de-France, 93000
98.10309Polska35408,21208Szczecin, województwo zachodniopomorskie
99.10285France métropolitaine32960,22376Mont-Saint-Aignan, Seine-Maritime, Haute-Normandie, 76130
100.10280France métropolitaine33496,22432Reims, Marne, Champagne-Ardenne, BUROPOLE 5CS 1000351721 REIMS CEDEX
101.10262Martinique21648,30072Fort-de-France
102.10256United States of America16800,24384Chicago, Cook County, Illinois, 60652
103.10194United States of America16792,24352Chicago, Cook County, Illinois, 60612
104.10191France métropolitaine33176,22560Clamart, Antony, Hauts-de-Seine, Île-de-France, 92140
105.10182United States of America16808,24384Chicago, Cook County, Illinois, 60620
106.10160France métropolitaine33216,22536Rosny-sous-Bois, Bobigny, Seine-Saint-Denis, Île-de-France, 93110
107.10153France métropolitaine33344,22032Hem, Lille, Nord, Nord-Pas-de-Calais, 59510
108.10127France métropolitaine33320,22040Centre, Lille, Nord, Nord-Pas-de-Calais, 59013
109.10108日本 (Japan)58480,24048手稲区 (Teine Ward), 日本 (Japan)
110.10103Österreich35368,22696Makartviertel, Linz, Bezirk Linz (Stadt), Oberösterreich, 4018
111.10075France métropolitaine33192,21928Saint-Pol-sur-Mer, Dunkerque, Nord, Nord-Pas-de-Calais, 59430
112.10027France métropolitaine33352,23992Béziers, Hérault, Languedoc-Roussillon, 34500
113.10004Deutschland34368,21320Mitte (Stadtteil), Stadtbezirk Bremen-Mitte, Bremen, 28195

Data from 22nd May 2013; (c) OpenStreetMap, ODbL 1.0

See count of nodes per tile