In early 19th century Helsinge was as small as the nearby villages, but it had an inn and a church and the vicar had another parish under him, Valby. Through the 19th century Helsinge grew. In 1840 23% of the 1258 inhabitants in the parish lived in the city, but in 1901 the percentage was 43% of 1647. In the meantime the town had got among other things both a judge (1848), a doctor (1859), a post office (1863), telegraphy (1872) and a railroad (1897).
The town was years ago elected the ugliest town in Denmark by a journalist from national television, Peter Olesen, which is why among its inhabitants it has the popular name Hæslinge (Hæslig=ugly). Recently a great wall was built as a kind of town portal, but that has got the nickname the Berlin Wall, because it divides the space in an unfortunate way.
- Christiern Pedersen (c.1480 – 1554 in Helsinge) a canon, humanist scholar, writer, printer and publisher 
- Jens Poul Andersen (1844 in Huseby, near Annisse – 1935) an inventor, constructed cameras
- Niels Fennet (born 1944 in Valby, near Helsinge) an engineer and businessman, founded Cabinn Hotels
- Thor Pedersen (born 1945) politician, member of Helsinge Municipal Council 1974-1986, Mayor 1978-1986, member of Folketinget & Government Minister.
- Bente Hammer (born 1950) a textile artist and fashion designer, moved to Bornholm in 1987
- Anders Bircow (born 1951) a Danish actor and comedian 
- Yuko Takada Keller (born 1958) an artist, curator and essayist based in Helsinge since 1997
- Christian Brøns (born 1977 in Kagerup, near Helsinge) a Danish singer
- Rolf Sørensen (born 1965) a former Danish professional road bicycle racer, silver medallist at the 1996 Summer Olympics, now a cycling commentator and agent
- Poul-Erik Høyer Larsen (born 1965) a retired Danish badminton player and President of the Badminton World Federation
- Morten Petersen (born 1978) a Danish retired footballer, over 200 caps for Lyngby Boldklub
- Nikolaj Markussen (born 1988) a Danish handballer who plays for Bjerringbro-Silkeborg
- Sandra Toft (born 1989) a Danish handball goalkeeper
Twin towns — Sister citiesEdit
Helsinge is twinned with:
- Lubsko, Poland
|Wikimedia Commons has media related to Helsinge (Gribskov Kommune).|