| | West Islip, NY | Lake Ronkonkoma, NY | United States |
| Median Home Age | 61 | 53 | 42 |
| Median Home Cost | $509,400 | $453,000 | $338,100 |
| Home Appr. Last 12 months | 13.1% | 13.1% | 16.6% |
| Home Appr. Last 5 yrs. | 48.6% | 48.6% | 57.0% |
| Home Appr. Last 10 yrs. | 71.3% | 71.3% | 101.1% |
| Property Tax Rate | $22.7 | $21.7 | $11.0 |
| Homes Owned | 94.1% | 63.3% | 57.4% |
| Housing Vacant | 2.1% | 6.3% | 11.2% |
| Homes Rented | 3.9% | 30.4% | 31.4% |
| space | | | |
| Avg Rent For Home Or Apartment | | | |
| | West Islip, NY | Lake Ronkonkoma, NY | United States |
| Average Rent | $3,020 | $2,780 | $1,840 |
| Studio Apartment | $1,590 | $1,470 | $1,080 |
| 1 Bedroom Home or Apartment | $1,990 | $1,830 | $1,180 |
| 2 Bedroom Home or Apartment | $2,380 | $2,200 | $1,430 |
| 3 Bedroom Home or Apartment | $3,060 | $2,820 | $1,860 |
| 4 Bedroom Home or Apartment | $3,370 | $3,110 | $2,160 |
| space1 | | | |
| Vacant Housing | | | |
| | West Islip, NY | Lake Ronkonkoma, NY | United States |
| Vacant For Rent | 0.0% | 0.5% | 1.9% |
| Vacant Rented | 0.0% | 0.4% | 0.4% |
| Vacant For Sale | 0.7% | 0.7% | 0.7% |
| Vacant Sold | 0.3% | 0.5% | 0.4% |
| Vacant Vacation | 0.3% | 0.4% | 3.6% |
| Vacant Other | 0.7% | 3.8% | 4.1% |
| space2 | | | |
| Owner-Occupied Housing Value | | | |
| | West Islip, NY | Lake Ronkonkoma, NY | United States |
| Less Than $20,000 | 0.1% | 0.2% | 2.6% |
| $20,000 to $39,999 | 0.1% | 1.2% | 2.4% |
| $40,000 to $59,999 | 0.4% | 0.4% | 2.8% |
| $60,000 to $79,999 | 0.3% | 0.0% | 3.9% |
| $80,000 to $99,999 | 0.3% | 0.3% | 4.5% |
| $100,000 to $149,999 | 0.1% | 0.1% | 11.3% |
| $150,000 to $199,999 | 0.8% | 1.2% | 13.0% |
| $200,000 to $299,999 | 3.0% | 12.0% | 20.1% |
| $300,000 to $399,999 | 20.1% | 38.8% | 13.6% |
| $400,000 to $499,999 | 37.8% | 30.6% | 8.3% |
| $500,000 to $749,999 | 26.9% | 12.9% | 9.7% |
| $750,000 to $999,999 | 6.0% | 1.6% | 3.9% |
| $1,000,000 to $1,499,999 | 2.4% | 0.3% | 2.2% |
| $1,500,000 to $1,999,999 | 0.8% | 0.0% | 0.8% |
| $2,000,000 and over | 0.9% | 0.3% | 1.1% |
| space3 | | | |
| Housing Units By Year Built | | | |
| | West Islip, NY | Lake Ronkonkoma, NY | United States |
| 2015 and Newer | 0.1% | 0.0% | 0.2% |
| 2010 to 2014 | 2.3% | 3.7% | 13.6% |
| 2000 to 2009 | 2.3% | 3.7% | 13.6% |
| 1990 to 1999 | 3.5% | 4.7% | 13.6% |
| 1980 to 1989 | 3.2% | 5.2% | 13.2% |
| 1970 to 1979 | 11.4% | 27.9% | 14.8% |
| 1960 to 1969 | 3.5% | 4.7% | 13.6% |
| 1950 to 1959 | 39.9% | 20.2% | 10.0% |
| 1940 to 1949 | 5.8% | 8.6% | 4.7% |
| 1939 or Earlier | 4.0% | 6.8% | 12.2% |