Empirical correlations are presented for the density and viscosity of aqueous formaldehyde solutions as a function of temperature (T) and overall weight percentage of formaldehyde (W-F) Experimental density data from the literature, at T = 288-338 K and with W-F - 1.6-50 wt %, are described with an average absolute residual (AAR) of 0.14%. Experimental viscosity data, both new and from the literature, at T = 288-333 K and with W-F = 1.6-50 wt %, are described with an AAR of 1.8%. The residuals of the correlations are free of trending effects as a function of T and W-F. It is shown that both properties can be described using liquid mixture correlation methods from the literature with almost the same accuracy relative to the empirical correlations.