There are thousands of "The Swarm" in their deployments.
Demmas' fleet (his faction on the split world of Ilari) numbers roughly twenty- "Warlord."

"Scorpion." A single bioship defeated a fleet of 15 Borg cubes. 133 bioships were assembled at the entrance to their dimension. Chakotay says the Borg control thousands of systems, and have millions of ships.
"Scorpion" - damage done to the Borg: "Eight planets destroyed, three hundred twelve vessels disabled, four million, six hundred twenty-one Borg eliminated."
"Concerning Flight" - Voyager's sensors register twenty seven different kinds of ships in orbit around one planet. Thirteen are launched from the surface after Voyager.
"Prey" - the original Species 8472 invasion involved "thousands" of ships, and 8472 destroyed "hundreds" of Borg worlds, killing "millions" of drones.
"The Omega Directive" - a Borg experiment with an Omega molecule wiped out a fleet of 29 Borg vessels and 600,000 drones.
"Hope and Fear" - Arcturis's people were swarmed by a fleet of hundreds of cubes.
"Night" - a fleet of thousands of difficult to detect ships lies in wait ahead, claims the Malon captain Emck.
"Extreme Risk" - an unsupplied ship, halfway to falling apart in the middle of nowhere, can easily provide all the facilities needed to design a new shuttlecraft. On board fabrication can provide for its construction in a week's time.
"Counterpoint" - a dozen Devore warships lie in wait for Voyager in a nebula.
"Dark Frontier" - a Borg probe vessel leaves behind 8,000 tons of debris when Voyager blows it up.
Well outside of Borg space, there were a total of 4 Borg vessels within ten light years of Voyager. The Borg cube studied by the Hansens was a 28 cubic kilometer vessel with 129,000 drones on board; it later received 179,000 more.
"Think Tank" - 23 Hazari ships are trying to catch Voyager.
"Relativity" - the UFP will also later have timeships, e.g., the Relativity.
"Equinox" - a Nova class science vessel began voyage with a crew of 78, and at least 11 decks.
"Dragon's Teeth" - the Vaadwaar recover over 200 fighters. (53 make it out.)
"Riddles" - the Ba'Neth are hiding something huge in a nine million terawatt cloaking field. 3000 life forms, 22 ships. "Tsunkatse" - the fights are being transmitted from a ship outside of Voyager's weight class - five million metric tons with reinforced hull plating, covariant shielding, and neutronic weaponry. In practice, it is not so powerful.
"Collective" - there should be "thousands" of drones manning a cube, and it is normally run by five thousand according to Seven, but it only has five. As a result, it gets damaged by the Delta Flyer and is held off by Voyager, although Voyager is unable to penetrate its shields.
The Delta Flyer is 800 meters from a shield generator while held inside the cube.
"Ashes to Ashes" - two of the formerly Borg children create 1/1000th scale models of Borg vessels. These appear to be roughly 15 cm on a side, implying they are models of a 150m wide vessel.
"The Haunting of Deck 12" - Voyager's cargo bay doors have manual controls just in case something goes wrong with the automatic controls.
"Unimatrix Zero" - Cube 620 has 64,000 drones on board. Sphere 878 has 11,000. Cube 1184 has one of the highest numbers seen. The Borg fleet has deployments in the Beta quadrant.
"Flesh and Blood" - suddenly, the Hirogen are no longer quite so dangerous. A small Hirogen ship is no match for Voyager, which disables its weapons after it batters Voyager's shields down to 50%.
"Prophecy" - a D7 cruiser has a crew of 204.