| australia | | uncultured nitrobacter sp. | species | 1 | 0 |
| australia | south australia | nitrobacter | genus | 0 | 1 |
| belgium | flemish region | nitrobacter alkalicus | species | 2 | 0 |
| belgium | flemish region | nitrobacter hamburgensis | species | 2 | 0 |
| belgium | flemish region | nitrobacter sp. | species | 45 | 0 |
| belgium | flemish region | nitrobacter vulgaris | species | 2 | 0 |
| belgium | flemish region | nitrobacter winogradskyi | species | 4 | 0 |
| canada | british columbia | nitrobacter | genus | 0 | 1 |
| china | | nitrobacter alkalicus | species | 2 | 0 |
| china | | nitrobacter hamburgensis | species | 5 | 0 |
| china | | nitrobacter sp. nku | species | 1 | 0 |
| china | | nitrobacter vulgaris | species | 3 | 0 |
| china | | nitrobacter winogradskyi | species | 10 | 0 |
| china | | uncultured nitrobacter sp. | species | 107 | 0 |
| china | beijing | nitrobacter sp. enrichment culture clone n3 | species | 1 | 0 |
| china | beijing | uncultured nitrobacter sp. | species | 9 | 0 |
| china | shandong | uncultured nitrobacter sp. | species | 1 | 0 |
| china | shanghai shi | nitrobacter | genus | 0 | 1 |
| china | sichuan | uncultured nitrobacter sp. | species | 5 | 0 |
| china | zhejiang | nitrobacter | genus | 0 | 1 |
| france | | uncultured nitrobacter sp. | species | 1 | 0 |
| france | ile-de-france region | nitrobacter | genus | 0 | 2 |
| germany | | nitrobacter sp. enrichment culture clone drad-1 | species | 1 | 0 |
| germany | | uncultured nitrobacter sp. | species | 1 | 0 |
| germany | hamburg | nitrobacter vulgaris | species | 192 | 0 |
| india | | nitrobacter sp. enrichment culture isolate dgge gel band en1 | species | 1 | 0 |
| japan | | nitrobacter sp. | species | 1 | 0 |
| japan | | uncultured nitrobacter sp. | species | 6 | 0 |
| japan | hokkaido prefecture | uncultured nitrobacter sp. | species | 1 | 0 |
| japan | kyoto prefecture | uncultured nitrobacter sp. | species | 1 | 0 |
| marshall islands | | nitrobacter | genus | 0 | 1 |
| nigeria | delta | nitrobacter | genus | 0 | 1 |
| nigeria | niger | nitrobacter | genus | 0 | 1 |
| pakistan | | uncultured nitrobacter sp. | species | 2 | 0 |
| russia | astrakhan oblast | nitrobacter | genus | 0 | 1 |
| russia | moscow city | nitrobacter | genus | 0 | 1 |
| russia | moscow oblast | nitrobacter | genus | 0 | 1 |
| saudi arabia | | uncultured nitrobacter sp. | species | 1 | 0 |
| south africa | | uncultured nitrobacter sp. | species | 18 | 0 |
| south africa | the western cape province | nitrobacter sp. | species | 1 | 0 |
| spain | | uncultured nitrobacter sp. | species | 6 | 0 |
| taiwan | | uncultured nitrobacter sp. | species | 10 | 0 |
| taiwan | taiwan municipality | uncultured nitrobacter sp. | species | 10 | 0 |
| thailand | | uncultured nitrobacter sp. | species | 1 | 0 |
| thailand | bangkok | uncultured nitrobacter sp. | species | 1 | 0 |
| united states | colorado | nitrobacter vulgaris | species | 1 | 0 |
| united states | kansas | uncultured nitrobacter sp. | species | 2 | 0 |
| united states | michigan | uncultured nitrobacter sp. | species | 3 | 0 |
| united states | minnesota | nitrobacter | genus | 0 | 1 |
| vietnam | ha noi city | nitrobacter vulgaris | species | 1 | 0 |
| vietnam | ha noi city | nitrobacter winogradskyi | species | 1 | 0 |