17th century: fortress and regiment
1652–1699
Founding
Cossacks and peasants from Stavyshche near Kyiv, led by Herasym Kondratiev, settle on the Psel. The Encyclopedia of Ukraine gives 1652; the official date is 1655.
The fortress
Voivode Kindrat Arsenyev builds an oak fortress against Tatar raids.
The Sumy regiment
Sumy becomes the seat of the Sumy Sloboda Cossack Regiment, with Kondratiev as its first colonel.
2,740 people
The first known population count.
The largest fortress
With a fortified suburb added, Sumy becomes the largest fortress in Sloboda Ukraine.
Crimean campaigns
Sumy serves as an assembly point for the Crimean campaigns.
18th century: from regiment to district town
1700–1799
Resurrection Church
The city's first stone building, the Cossack Baroque Resurrection Church, is consecrated.
Peter I in Sumy
During the Great Northern War Peter I keeps his headquarters in Sumy from December 1708 to January 1709.
Glassworks
A glassworks is founded in the city.
7,700 people
The town has five schools.
Sloboda regiments commission
A commission governing all the Sloboda regiments sits in Sumy.
End of the regiment
The Cossack regiment is abolished and turned into the Sumy Hussars; Sumy becomes a provincial centre of Sloboda Ukraine governorate.
Transfiguration Cathedral
The first version of the cathedral on Soborna St is built.
District town
Sumy becomes a district town of the Kharkiv vicegerency.
Coat of arms
The coat of arms with three hunting bags is approved.
Walls removed
The fortress walls are dismantled.
Fire
A great fire; the Resurrection Church burns and is rebuilt in the early 19th century.
19th century: theatre, sugar, railway
1800–1899
First theatre
The first theatre opens in Sumy.
Kharkiv governorate
Sumy becomes part of Kharkiv governorate, until 1923.
St Elijah's Church
The church at today's 45 Yaroslava Mudroho St is built.
St Peter and Paul Church
A church is built at the city cemetery.
Sugar refinery
Ivan Kharytonenko founds a sugar refinery, and Sumy becomes a hub of the sugar industry.
Tchaikovsky in Nyzy
The composer stays at the Kondratiev estate near Sumy and in 1874 begins his opera Vakula the Smith.
The railway
Sumy station opens on the Vorozhba–Merefa line.
New cathedral
The Transfiguration Cathedral is rebuilt with a 56 m bell tower.
Chekhov in Luka
Anton Chekhov and his family spend two summers at the Lintvarev estate.
Kharytonenko mansion
The main house at 4 Troitska St is built.
Belgian workshops
A Belgian company founds engineering workshops, the future Frunze plant.
27,564 people
The first imperial census.
Cadet school
The school is founded with Ivan and Pavlo Kharytonenko's money; the Ivan Kharytonenko monument is unveiled the same year.
1900–1945: revolutions and wars
1900–1945
Trinity Cathedral
Built to the Scholz design with Pavlo Kharytonenko's money.
Korepanov theatre
A city theatre goes up at 6 Pokrovska St.
50,400 people
The city has nearly doubled since 1897.
Fighting for Sumy
Bolsheviks and UNR forces fight for the city.
Museums
Nykanor Onatsky's art museum and the local history museum open.
Holodomor
Famine kills thousands in Sumy region; the city commemorates the victims every year.
Sumy Oblast
The oblast is created with Sumy as its capital.
Occupation
German troops occupy the city.
The Holocaust
The Nazis murder about a thousand Jews of Sumy.
Liberation
The Red Army retakes Sumy after almost two years of occupation.
Polish soldiers
About 30,000 soldiers of the Polish Army train in Sumy.
1945–2013: an industrial city
1945–2013
Sumykhimprom
A superphosphate plant is founded, the future chemical giant with Khimmistechko around it.
Chekhov museum
The house museum opens in Luka.
Trolleybus
The first route runs from Khimhorodok to the station.
The 'Daisy'
The round Central Market is completed.
291,264 people
Nearly five times the pre-war population.
Independence
Ukraine becomes independent; Sumy has about 303,000 people, its all-time peak. Central streets get their old names back.
Yuvileinyi
The 25,830-seat stadium opens.
End of sugar
The sugar refinery closes.
2014–2026: Maidan and war
2014–2026
Lenin falls
During the Euromaidan, activists topple a 16-tonne Lenin statue.
Decommunisation
87 streets, lanes and squares are renamed.
Invasion
Day one of the full-scale war: fighting on Herasyma Kondratieva St by the cadet school. The city is encircled.
First corridor
An airstrike kills 22 civilians; about 5,000 people leave by humanitarian corridor.
Liberation
Sumy region is liberated; Russian troops are gone by 8 April.
Decolonisation
211 place names in the community are renamed.
Kursk operation
Ukrainian forces cross from Sumy region into Russia's Kursk Oblast; strikes on the city intensify.
Palm Sunday
Two Iskander-M ballistic missiles hit the city centre: 35 killed, including two children, and more than 120 wounded.
Cathedral hit
A drone hits the Resurrection Cathedral during a service; no one is killed.
Hero City
Decree No. 720/2025 names Sumy a Hero City of Ukraine.
Kyianytsia
A Russian strike destroys the Kharytonenko palace in Kyianytsia near Sumy.
Strike on the centre
A strike on a central street kills 4, including a five-year-old girl, and wounds 33.
Trains stop at Konotop
Because of shelling, trains on the Sumy line run only as far as Konotop.
Guided bombs on homes
Two days of guided-bomb strikes kill four, including a 16-year-old girl, and wound more than 20.
Population
| Year | Residents |
|---|---|
| 1660 | 2 740 |
| 1732 | 7 700 |
| 1850 | 10 256 |
| 1897 | 27 564 |
| 1926 | 43 814 |
| 1939 | 63 976 |
| 1959 | 98 015 |
| 1970 | 159 168 |
| 1979 | 228 174 |
| 1989 | 291 264 |
| 1991 | ≈ 303,300 |
| 2001 | 293 141 |
| 2022 | 256 474 |
| 2025 | 268,409 (estimate) |
Census data and official estimates; 2025 is an estimate cited by Wikipedia.
Sources
- Encyclopedia of Ukraine: Sumy
- Encyclopedia of Ukraine: Sumy regiment
- Радіо Свобода: історія Сум
- Sumy — Wikipedia
- Battle of Sumy — Wikipedia
- 2025 Sumy airstrike — Wikipedia
- Указ № 720/2025
- Суспільне: дрон влучив у Воскресенський собор
- УкрНовини: палац Харитоненка в Кияниці
- 24 Канал: удар по центральній вулиці, 3.07.2026
- Слово і діло: атака 26.09.2026
- Суспільне: атака 27.09.2026