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National origin of complaints registered and inquiries opened by the European Ombudsman in 2018
| Country | Number of complaints | Number of inquiries opened |
| Spain | 393 | 42 |
| Germany | 186 | 60 |
| United Kingdom | 186 | 36 |
| Poland | 179 | 16 |
| Belgium | 174 | 87 |
| France | 132 | 25 |
| Italy | 116 | 37 |
| Netherlands | 57 | 11 |
| Bulgaria | 56 | 10 |
| Romania | 56 | 9 |
| Greece | 54 | 17 |
| Hungary | 48 | 10 |
| Sweden | 47 | 15 |
| Portugal | 44 | 6 |
| Czech Republic | 39 | 7 |
| Austria | 35 | 15 |
| Ireland | 34 | 10 |
| Croatia | 31 | 6 |
| Luxembourg | 27 | 16 |
| Finland | 23 | 3 |
| Slovenia | 23 | 2 |
| Slovakia | 20 | 4 |
| Lithuania | 17 | 6 |
| Denmark | 16 | 5 |
| Cyprus | 11 | 3 |
| Malta | 8 | 4 |
| Latvia | 6 | 0 |
| Estonia | 6 | 3 |
| Other countries | 122 | 16 |
| Not known | 14 | 1 |