In 1974, LEGO released 13 LEGOLAND sets across 2 subthemes, all of these sets have been retired. Subthemes for that year included Town and Vehicle. For that year, the total price of all retail sets cost $51, today those sets are valued around $5,245.
Most valuable 1974 LEGOLAND set
1650 Maersk Line Container Ship $3,454.52
Most owned 1974 LEGOLAND set
612 Tipper Truck
13 sets

360 Gravel Works

Theme LEGOLAND
Year 1974
Pieces 211
Availability Retired
360 LEGOLAND Gravel Works
Retail $13.99
Value $393.52
Growth  +2712.9%
Annual growth 6.7%

361 Tea Garden Cafe

Theme / Subtheme LEGOLAND / Town
Year 1974
Pieces 209
Availability Retired
361 LEGOLAND Town Tea Garden Cafe
Retail $2.89

612 Tipper Truck

Theme LEGOLAND
Year 1974
Pieces 23
Availability Retired
612 LEGOLAND Tipper Truck
Retail $2.49
Value $55.38
Growth  +2124.1%
Annual growth 3.1%

613 Bi-plane

Theme / Subtheme LEGOLAND / Town
Year 1974
Pieces 18
Availability Retired
613 LEGOLAND Town Bi-plane
Retail $2.49
Value $82.40
Growth  +3209.2%
Annual growth 7.1%

614-2 Digger

Theme LEGOLAND
Year 1974
Pieces 31
Availability Retired
614-2 LEGOLAND Digger
Retail $0.49
Value $70.35
Growth  +14257.1%
Annual growth 8.7%

656 Car and Caravan

Theme LEGOLAND
Year 1974
Pieces 52
Availability Retired
656 LEGOLAND Car and Caravan
Retail $1.50
Value $144.16
Growth  +9510.7%
Annual growth 4.4%

657 Aircraft

Theme LEGOLAND
Year 1974
Pieces 37
Availability Retired
657 LEGOLAND Aircraft
Retail $0.99
Value $83.82
Growth  +8366.7%
Annual growth 5.9%

658 Fire Engine

Theme / Subtheme LEGOLAND / Vehicle
Year 1974
Pieces 38
Availability Retired
658 LEGOLAND Fire Engine
Retail $5.49

689 Grabber

Theme LEGOLAND
Year 1974
Pieces 46
Availability Retired
689 LEGOLAND Grabber
Retail $0.99
Value $131.72
Growth  +13205.1%
Annual growth 10.1%

690 Shell Garage

Theme LEGOLAND
Year 1974
Pieces 73
Availability Retired
690 LEGOLAND Shell Garage
Retail $0.99
Value $154.11
Growth  +15466.7%
Annual growth 5.1%

691 Rescue Helicopter

Theme / Subtheme LEGOLAND / Town
Year 1974
Pieces 62
Availability Retired
691 LEGOLAND Town Rescue Helicopter
Retail $0.99
Value $132.07
Growth  +13240.4%
Annual growth 5.7%

1552-2 Sterling Boeing 727

Theme LEGOLAND
Year 1974
Pieces 49
Availability Retired
1552-2 LEGOLAND Sterling Boeing 727
Retail $2.99
Value $542.75
Growth  +18052.2%
Annual growth 10.7%

1650 Maersk Line Container Ship

Theme LEGOLAND
Year 1974
Pieces 220
Availability Retired
1650 LEGOLAND Maersk Line Container Ship
Retail $14.99
Value $3,454.52
Growth  +22945.5%
Annual growth 11.3%